MARSHALL, C.J.

Marriage is a vital social institution. The exclusive commitment of two individuals to each other nurtures love and mutual support; it brings stability to our society. For those who choose to marry, and for their children, marriage provides an abundance of legal, financial, and social benefits. In return it imposes weighty legal, financial, and social obligations. The question before us is whether, consistent with the Massachusetts Constitution, the Commonwealth may deny the protections, benefits, and obligations conferred by civil marriage to two individuals of the same sex who wish to marry. We conclude that it may not. The Massachusetts Constitution affirms the dignity and equality of all individuals. It forbids the creation of second-class citizens. In reaching our conclusion we have given full deference to the arguments made by the Commonwealth. But it has failed to identify any constitutionally adequate reason for denying civil marriage to same-sex couples.

We are mindful that our decision marks a change in the history of our marriage law. Many people hold deep-seated religious, moral, and ethical convictions that marriage should be limited to the union of one man and one woman, and that homosexual conduct is immoral. Many hold equally strong religious, moral, and ethical convictions that same-sex couples are entitled to be married, and that homosexual persons should be treated no differently than their heterosexual neighbors. Neither view answers the question before us. Our concern is with the Massachusetts Constitution as a charter of governance for every person properly within its reach. "Our obligation is to define the liberty of all, not to mandate our own moral code." Lawrence v. Texas, 123 S.Ct. 2472, 2480 (2003) (Lawrence ), quoting Planned Parenthood of Southeastern Pa. v. Casey, 505 U.S. 833, 850 (1992).

Whether the Commonwealth may use its formidable regulatory authority to bar same-sex couples from civil marriage is a question not previously addressed by a Massachusetts appellate court. [FN3] It is a question the United States Supreme Court left open as a matter of Federal law in Lawrence, supra at 2484, where it was not an issue. There, the Court affirmed that the core concept of common human dignity protected by the Fourteenth Amendment to the United States Constitution precludes government intrusion into the deeply personal realms of consensual adult expressions of intimacy and one's choice of an intimate partner. The Court also reaffirmed the central role that decisions whether to marry or have children bear in shaping one's identity. Id. at 2481. The Massachusetts Constitution is, if anything, more protective of individual liberty and equality than the Federal Constitution; it may demand broader protection for fundamental rights; and it is less tolerant of government intrusion into the protected spheres of private life.

Barred access to the protections, benefits, and obligations of civil marriage, a person who enters into an intimate, exclusive union with another of the same sex is arbitrarily deprived of membership in one of our community's most rewarding and cherished institutions. That exclusion is incompatible with the constitutional principles of respect for individual autonomy and equality under law.

The plaintiffs include business executives, lawyers, an investment banker, educators, therapists, and a computer engineer. Many are active in church, community, and school groups. They have employed such legal means as are available to them--for example, joint adoption, powers of attorney, and joint ownership of real property--to secure aspects of their relationships. Each plaintiff attests a desire to marry his or her partner in order to affirm publicly their commitment to each other and to secure the legal protections and benefits afforded to married couples and their children.

The Department of Public Health (department) is charged by statute with safeguarding public health. See G.L. c. 17. Among its responsibilities, the department oversees the registry of vital records and statistics (registry), which "enforce[s] all laws" relative to the issuance of marriage licenses and the keeping of marriage records, see G.L. c. 17, § 4, and which promulgates policies and procedures for the issuance of marriage licenses by city and town clerks and registers. See, e.g., G.L. c. 207, §§ 20, 28A, and 37. The registry is headed by a registrar of vital records and statistics (registrar), appointed by the Commissioner of Public Health (commissioner) with the approval of the public health council and supervised by the commissioner. See G.L. c. 17, § 4.

In March and April, 2001, each of the plaintiff couples attempted to obtain a marriage license from a city or town clerk's office. As required under G.L. c. 207, they completed notices of intention to marry on forms provided by the registry, see G.L. c. 207, § 20, and presented these forms to a Massachusetts town or city clerk, together with the required health forms and marriage license fees. See G.L. c. 207, § 19. In each case, the clerk either refused to accept the notice of intention to marry or denied a marriage license to the couple on the ground that Massachusetts does not recognize same- sex marriage. [FN4], [FN5] Because obtaining a marriage license is a necessary prerequisite to civil marriage in Massachusetts, denying marriage licenses to the plaintiffs was tantamount to denying them access to civil marriage itself, with its appurtenant social and legal protections, benefits, and obligations. [FN6]

On April 11, 2001, the plaintiffs filed suit in the Superior Court against the department and the commissioner seeking a judgment that "the exclusion of the [p]laintiff couples and other qualified same-sex couples from access to marriage licenses, and the legal and social status of civil marriage, as well as the protections, benefits and obligations of marriage, violates Massachusetts law." See G.L. c. 231A. The plaintiffs alleged violation of the laws of the Commonwealth, including but not limited to their rights under arts. 1, 6, 7, 10, 12, and 16, and Part II, c. 1, § 1, art. 4, of the Massachusetts Constitution. [FN7], [FN8]

The department, represented by the Attorney General, admitted to a policy and practice of denying marriage licenses to same-sex couples. It denied that its actions violated any law or that the plaintiffs were entitled to relief. The parties filed cross motions for summary judgment.

A Superior Court judge ruled for the department. In a memorandum of decision and order dated May 7, 2002, he dismissed the plaintiffs' claim that the marriage statutes should be construed to permit marriage between persons of the same sex, holding that the plain wording of G.L. c. 207, as well as the wording of other marriage statutes, precluded that interpretation. Turning to the constitutional claims, he held that the marriage exclusion does not offend the liberty, freedom, equality, or due process provisions of the Massachusetts Constitution, and that the Massachusetts Declaration of Rights does not guarantee "the fundamental right to marry a person of the same sex." He concluded that prohibiting same-sex marriage rationally furthers the Legislature's legitimate interest in safeguarding the "primary purpose" of marriage, "procreation." The Legislature may rationally limit marriage to opposite-sex couples, he concluded, because those couples are "theoretically ... capable of procreation," they do not rely on "inherently more cumbersome" noncoital means of reproduction, and they are more likely than same-sex couples to have children, or more children.

After the complaint was dismissed and summary judgment entered for the defendants, the plaintiffs appealed. Both parties requested direct appellate review, which we granted.

General Laws c. 207 is both a gatekeeping and a public records statute. It sets minimum qualifications for obtaining a marriage license and directs city and town clerks, the registrar, and the department to keep and maintain certain "vital records" of civil marriages. The gatekeeping provisions of G.L. c. 207 are minimal. They forbid marriage of individuals within certain degrees of consanguinity, §§ 1 and 2, and polygamous marriages. See G.L. c. 207, § 4. See also G.L. c. 207, § 8 (marriages solemnized in violation of §§ 1, 2, and 4, are void ab initio). They prohibit marriage if one of the parties has communicable syphilis, see G.L. c. 207, § 28A, and restrict the circumstances in which a person under eighteen years of age may marry. See G.L. c. 207, §§ 7, 25, and 27. The statute requires that civil marriage be solemnized only by those so authorized. See G.L. c. 207, §§ 38-40.

The record-keeping provisions of G.L. c. 207 are more extensive. Marriage applicants file standard information forms and a medical certificate in any Massachusetts city or town clerk's office and tender a filing fee. G.L. c. 207, §§ 19-20, 28A. The clerk issues the marriage license, and when the marriage is solemnized, the individual authorized to solemnize the marriage adds additional information to the form and returns it (or a copy) to the clerk's office. G.L. c. 207, §§ 28, 30, 38-40 (this completed form is commonly known as the "marriage certificate"). The clerk sends a copy of the information to the registrar, and that information becomes a public record. See G.L. c. 17, § 4; G.L. c. 66, § 10. [FN9], [FN10]

In short, for all the joy and solemnity that normally attend a marriage, G.L. c. 207, governing entrance to marriage, is a licensing law. The plaintiffs argue that because nothing in that licensing law specifically prohibits marriages between persons of the same sex, we may interpret the statute to permit "qualified same sex couples" to obtain marriage licenses, thereby avoiding the question whether the law is constitutional. See School Comm. of Greenfield v. Greenfield Educ. Ass'n, 385 Mass. 70, 79 (1982), and cases cited. This claim lacks merit.

We interpret statutes to carry out the Legislature's intent, determined by the words of a statute interpreted according to "the ordinary and approved usage of the language." Hanlon v. Rollins, 286 Mass. 444, 447 (1934). The everyday meaning of "marriage" is "[t]he legal union of a man and woman as husband and wife," Black's Law Dictionary 986 (7th ed.1999), and the plaintiffs do not argue that the term "marriage" has ever had a different meaning under Massachusetts law. See, e.g., Milford v. Worcester, 7 Mass. 48, 52 (1810) (marriage "is an engagement, by which a single man and a single woman, of sufficient discretion, take each other for husband and wife"). This definition of marriage, as both the department and the Superior Court judge point out, derives from the common law. See Commonwealth v. Knowlton, 2 Mass. 530, 535 (1807) (Massachusetts common law derives from English common law except as otherwise altered by Massachusetts statutes and Constitution). See also Commonwealth v. Lane, 113 Mass. 458, 462-463 (1873) ("when the statutes are silent, questions of the validity of marriages are to be determined by the jus gentium, the common law of nations"); C.P. Kindregan, Jr., & M.L. Inker, Family Law and Practice § 1.2 (3d ed.2002). Far from being ambiguous, the undefined word "marriage," as used in G.L. c. 207, confirms the General Court's intent to hew to the term's common-law and quotidian meaning concerning the genders of the marriage partners.

The intended scope of G.L. c. 207 is also evident in its consanguinity provisions. See Chandler v. County Comm'rs of Nantucket County, 437 Mass. 430, 435 (2002) (statute's various provisions may offer insight into legislative intent). Sections 1 and 2 of G.L. c. 207 prohibit marriages between a man and certain female relatives and a woman and certain male relatives, but are silent as to the consanguinity of male-male or female-female marriage applicants. See G.L. c. 207, §§ 1-2. The only reasonable explanation is that the Legislature did not intend that same-sex couples be licensed to marry. We conclude, as did the judge, that G.L. c. 207 may not be construed to permit same-sex couples to marry. [FN11]

The plaintiffs' claim that the marriage restriction violates the Massachusetts Constitution can be analyzed in two ways. Does it offend the Constitution's guarantees of equality before the law? Or do the liberty and due process provisions of the Massachusetts Constitution secure the plaintiffs' right to marry their chosen partner? In matters implicating marriage, family life, and the upbringing of children, the two constitutional concepts frequently overlap, as they do here. See, e.g., M.L.B. v. S.L.J., 519 U.S. 102, 120 (1996) (noting convergence of due process and equal protection principles in cases concerning parent-child relationships); Perez v. Sharp, 32 Cal.2d 711, 728 (1948) (analyzing statutory ban on interracial marriage as equal protection violation concerning regulation of fundamental right). See also Lawrence, supra at 2482 ("Equality of treatment and the due process right to demand respect for conduct protected by the substantive guarantee of liberty are linked in important respects, and a decision on the latter point advances both interests"); Bolling v. Sharpe, 347 U.S. 497 (1954) (racial segregation in District of Columbia public schools violates the due process clause of the Fifth Amendment to the United States Constitution), decided the same day as Brown v. Board of Educ. of Topeka, 347 U.S. 483 (1954) (holding that segregation of public schools in the States violates the equal protection clause of the Fourteenth Amendment). Much of what we say concerning one standard applies to the other.

We begin by considering the nature of civil marriage itself. Simply put, the government creates civil marriage. In Massachusetts, civil marriage is, and since pre-Colonial days has been, precisely what its name implies: a wholly secular institution. See Commonwealth v. Munson, 127 Mass. 459, 460-466 (1879) (noting that "[i]n Massachusetts, from very early times, the requisites of a valid marriage have been regulated by statutes of the Colony, Province, and Commonwealth," and surveying marriage statutes from 1639 through 1834). No religious ceremony has ever been required to validate a Massachusetts marriage. Id.

In a real sense, there are three partners to every civil marriage: two willing spouses and an approving State. See DeMatteo v. DeMatteo, 436 Mass. 18, 31 (2002) ("Marriage is not a mere contract between two parties but a legal status from which certain rights and obligations arise"); Smith v. Smith, 171 Mass. 404, 409 (1898) (on marriage, the parties "assume[ ] new relations to each other and to the State"). See also French v. McAnarney, 290 Mass. 544, 546 (1935). While only the parties can mutually assent to marriage, the terms of the marriage--who may marry and what obligations, benefits, and liabilities attach to civil marriage--are set by the Commonwealth. Conversely, while only the parties can agree to end the marriage (absent the death of one of them or a marriage void ab initio), the Commonwealth defines the exit terms. See G.L. c. 208.

Civil marriage is created and regulated through exercise of the police power. See Commonwealth v. Stowell, 389 Mass. 171, 175 (1983) (regulation of marriage is properly within the scope of the police power). "Police power" (now more commonly termed the State's regulatory authority) is an old-fashioned term for the Commonwealth's lawmaking authority, as bounded by the liberty and equality guarantees of the Massachusetts Constitution and its express delegation of power from the people to their government. In broad terms, it is the Legislature's power to enact rules to regulate conduct, to the extent that such laws are "necessary to secure the health, safety, good order, comfort, or general welfare of the community" (citations omitted). Opinion of the Justices, 341 Mass. 760, 785 (1960). [FN12] See Commonwealth v. Alger, 7 Cush. 53, 85 (1851).

Without question, civil marriage enhances the "welfare of the community." It is a "social institution of the highest importance." French v. McAnarney, supra. Civil marriage anchors an ordered society by encouraging stable relationships over transient ones. It is central to the way the Commonwealth identifies individuals, provides for the orderly distribution of property, ensures that children and adults are cared for and supported whenever possible from private rather than public funds, and tracks important epidemiological and demographic data.

Marriage also bestows enormous private and social advantages on those who choose to marry. Civil marriage is at once a deeply personal commitment to another human being and a highly public celebration of the ideals of mutuality, companionship, intimacy, fidelity, and family. "It is an association that promotes a way of life, not causes; a harmony in living, not political faiths; a bilateral loyalty, not commercial or social projects." Griswold v. Connecticut, 381 U.S. 479, 486 (1965). Because it fulfils yearnings for security, safe haven, and connection that express our common humanity, civil marriage is an esteemed institution, and the decision whether and whom to marry is among life's momentous acts of self-definition.

Tangible as well as intangible benefits flow from marriage. The marriage license grants valuable property rights to those who meet the entry requirements, and who agree to what might otherwise be a burdensome degree of government regulation of their activities. [FN13] See Leduc v. Commonwealth, 421 Mass. 433, 435 (1995), cert. denied, 519 U.S. 827 (1996) ( "The historical aim of licensure generally is preservation of public health, safety, and welfare by extending the public trust only to those with proven qualifications"). The Legislature has conferred on "each party [in a civil marriage] substantial rights concerning the assets of the other which unmarried cohabitants do not have." Wilcox v. Trautz, 427 Mass. 326, 334 (1998). See Collins v. Guggenheim, 417 Mass. 615, 618 (1994) (rejecting claim for equitable distribution of property where plaintiff cohabited with but did not marry defendant); Feliciano v. Rosemar Silver Co., 401 Mass. 141, 142 (1987) (government interest in promoting marriage would be "subverted" by recognition of "a right to recover for loss of consortium by a person who has not accepted the correlative responsibilities of marriage"); Davis v. Misiano, 373 Mass. 261, 263 (1977) (unmarried partners not entitled to rights of separate support or alimony). See generally Attorney Gen. v. Desilets, 418 Mass. 316, 327-328 & nn. 10, 11 (1994).

The benefits accessible only by way of a marriage license are enormous, touching nearly every aspect of life and death. The department states that "hundreds of statutes" are related to marriage and to marital benefits. With no attempt to be comprehensive, we note that some of the statutory benefits conferred by the Legislature on those who enter into civil marriage include, as to property: joint Massachusetts income tax filing (G.L. c. 62C, § 6); tenancy by the entirety (a form of ownership that provides certain protections against creditors and allows for the automatic descent of property to the surviving spouse without probate) (G.L. c. 184, § 7); extension of the benefit of the homestead protection (securing up to $300,000 in equity from creditors) to one's spouse and children (G.L. c. 188, § 1); automatic rights to inherit the property of a deceased spouse who does not leave a will (G.L. c. 190, § 1); the rights of elective share and of dower (which allow surviving spouses certain property rights where the decedent spouse has not made adequate provision for the survivor in a will) (G.L. c. 191, § 15, and G.L. c. 189); entitlement to wages owed to a deceased employee (G.L. c. 149, § 178A [general] and G.L. c. 149, § 178C [public employees] ); eligibility to continue certain businesses of a deceased spouse (e.g., G.L. c. 112, § 53 [dentist] ); the right to share the medical policy of one's spouse (e.g., G.L. c. 175, § 108, Second [a ] [3] [defining an insured's "dependent" to include one's spouse), see Connors v. Boston, 430 Mass. 31, 43 (1999) [domestic partners of city employees not included within the term "dependent" as used in G.L. c. 32B, § 2] ); thirty-nine week continuation of health coverage for the spouse of a person who is laid off or dies (e.g., G.L. c. 175, § 110G); preferential options under the Commonwealth's pension system (see G.L. c. 32, § 12[2] ["Joint and Last Survivor Allowance"] ); preferential benefits in the Commonwealth's medical program, MassHealth (e.g., 130 Code Mass. Regs. § 515.012[A] prohibiting placing a lien on long-term care patient's former home if spouse still lives there); access to veterans' spousal benefits and preferences (e.g., G.L. c. 115, § 1 [defining "dependents"] and G.L. c. 31, § 26 [State employment] and § 28 [municipal employees] ); financial protections for spouses of certain Commonwealth employees (fire fighters, police officers, prosecutors, among others) killed in the performance of duty (e.g., G.L. c. 32, §§ 100-103); the equitable division of marital property on divorce (G.L. c. 208, § 34); temporary and permanent alimony rights (G.L. c. 208, §§ 17 and 34); the right to separate support on separation of the parties that does not result in divorce (G.L. c. 209, § 32); and the right to bring claims for wrongful death and loss of consortium, and for funeral and burial expenses and punitive damages resulting from tort actions (G.L. c. 229, §§ 1 and 2; G.L. c. 228, § 1. See Feliciano v. Rosemar Silver Co., supra ).

Exclusive marital benefits that are not directly tied to property rights include the presumptions of legitimacy and parentage of children born to a married couple (G.L. c. 209C, § 6, and G.L. c. 46, § 4B); and evidentiary rights, such as the prohibition against spouses testifying against one another about their private conversations, applicable in both civil and criminal cases (G.L. c. 233, § 20). Other statutory benefits of a personal nature available only to married individuals include qualification for bereavement or medical leave to care for individuals related by blood or marriage (G.L. c. 149, § 52D); an automatic "family member" preference to make medical decisions for an incompetent or disabled spouse who does not have a contrary health care proxy, see Shine v. Vega, 429 Mass. 456, 466 (1999); the application of predictable rules of child custody, visitation, support, and removal out-of-State when married parents divorce (e.g., G.L. c. 208, § 19 [temporary custody], § 20 [temporary support], § 28 [custody and support on judgment of divorce], § 30 [removal from Commonwealth], and § 31 [shared custody plan]; priority rights to administer the estate of a deceased spouse who dies without a will, and requirement that surviving spouse must consent to the appointment of any other person as administrator (G.L. c. 38, § 13 [disposition of body], and G.L. c. 113, § 8 [anatomical gifts] ); and the right to interment in the lot or tomb owned by one's deceased spouse (G.L. c. 114, §§ 29-33).

Where a married couple has children, their children are also directly or indirectly, but no less auspiciously, the recipients of the special legal and economic protections obtained by civil marriage. Notwithstanding the Commonwealth's strong public policy to abolish legal distinctions between marital and nonmarital children in providing for the support and care of minors, see Department of Revenue v. Mason M., 439 Mass. 665 (2003); Woodward v. Commissioner of Social Sec., 435 Mass. 536, 546 (2002), the fact remains that marital children reap a measure of family stability and economic security based on their parents' legally privileged status that is largely inaccessible, or not as readily accessible, to nonmarital children. Some of these benefits are social, such as the enhanced approval that still attends the status of being a marital child. Others are material, such as the greater ease of access to family-based State and Federal benefits that attend the presumptions of one's parentage.

It is undoubtedly for these concrete reasons, as well as for its intimately personal significance, that civil marriage has long been termed a "civil right." See, e.g., Loving v. Virginia, 388 U.S. 1, 12 (1967) ("Marriage is one of the 'basic civil rights of man,' fundamental to our very existence and survival"), quoting Skinner v. Oklahoma, 316 U.S. 535, 541 (1942); Milford v. Worcester, 7 Mass. 48, 56 (1810) (referring to "civil rights incident to marriages"). See also Baehr v. Lewin, 74 Haw. 530, 561 (1993) (identifying marriage as a "civil right[ ]"); Baker v. State, 170 Vt. 194, 242 (1999) (Johnson, J., concurring in part and dissenting in part) (same). The United States Supreme Court has described the right to marry as "of fundamental importance for all individuals" and as "part of the fundamental 'right of privacy' implicit in the Fourteenth Amendment's Due Process Clause." Zablocki v. Redhail, 434 U.S. 374, 384 (1978). See Loving v. Virginia, supra ("The freedom to marry has long been recognized as one of the vital personal rights essential to the orderly pursuit of happiness by free men"). [FN14]

Without the right to marry--or more properly, the right to choose to marry--one is excluded from the full range of human experience and denied full protection of the laws for one's "avowed commitment to an intimate and lasting human relationship." Baker v. State, supra at 229. Because civil marriage is central to the lives of individuals and the welfare of the community, our laws assiduously protect the individual's right to marry against undue government incursion. Laws may not "interfere directly and substantially with the right to marry." Zablocki v. Redhail, supra at 387. See Perez v. Sharp, 32 Cal.2d 711, 714 (1948) ("There can be no prohibition of marriage except for an important social objective and reasonable means"). [FN15]

Unquestionably, the regulatory power of the Commonwealth over civil marriage is broad, as is the Commonwealth's discretion to award public benefits. See Commonwealth v. Stowell, 389 Mass. 171, 175 (1983) (marriage); Moe v. Secretary of Admin. & Fin., 382 Mass. 629, 652 (1981) (Medicaid benefits). Individuals who have the choice to marry each other and nevertheless choose not to may properly be denied the legal benefits of marriage. See Wilcox v. Trautz, 427 Mass. 326, 334 (1998); Collins v. Guggenheim, 417 Mass. 615, 618 (1994); Feliciano v. Rosemar Silver Co., 401 Mass. 141, 142 (1987). But that same logic cannot hold for a qualified individual who would marry if she or he only could.

The Massachusetts Constitution protects matters of personal liberty against government incursion as zealously, and often more so, than does the Federal Constitution, even where both Constitutions employ essentially the same language. See Planned Parenthood League of Mass., Inc. v. Attorney Gen., 424 Mass. 586, 590 (1997); Corning Glass Works v. Ann & Hope, Inc. of Danvers, 363 Mass. 409, 416 (1973). That the Massachusetts Constitution is in some instances more protective of individual liberty interests than is the Federal Constitution is not surprising. Fundamental to the vigor of our Federal system of government is that "state courts are absolutely free to interpret state constitutional provisions to accord greater protection to individual rights than do similar provisions of the United States Constitution." Arizona v. Evans, 514 U.S. 1, 8 (1995). [FN18]

The individual liberty and equality safeguards of the Massachusetts Constitution protect both "freedom from" unwarranted government intrusion into protected spheres of life and "freedom to" partake in benefits created by the State for the common good. See Bachrach v. Secretary of the Commonwealth, 382 Mass. 268, 273 (1981); Dalli v. Board of Educ., 358 Mass. 753, 759 (1971). Both freedoms are involved here. Whether and whom to marry, how to express sexual intimacy, and whether and how to establish a family--these are among the most basic of every individual's liberty and due process rights. See, e.g., Lawrence, supra at 2481; Planned Parenthood of Southeastern Pa. v. Casey, 505 U.S. 833, 851 (1992); Zablocki v. Redhail, 434 U.S. 374, 384 (1978); Roe v. Wade, 410 U.S. 113, 152-153 (1973); Eisenstadt v. Baird, 405 U.S. 438, 453 (1972); Loving v. Virginia, supra. And central to personal freedom and security is the assurance that the laws will apply equally to persons in similar situations. "Absolute equality before the law is a fundamental principle of our own Constitution." Opinion of the Justices, 211 Mass. 618, 619 (1912). The liberty interest in choosing whether and whom to marry would be hollow if the Commonwealth could, without sufficient justification, foreclose an individual from freely choosing the person with whom to share an exclusive commitment in the unique institution of civil marriage.

The Massachusetts Constitution requires, at a minimum, that the exercise of the State's regulatory authority not be "arbitrary or capricious." Commonwealth v. Henry's Drywall Co., 366 Mass. 539, 542 (1974). [FN19] Under both the equality and liberty guarantees, regulatory authority must, at very least, serve "a legitimate purpose in a rational way"; a statute must "bear a reasonable relation to a permissible legislative objective." Rushworth v. Registrar of Motor Vehicles, 413 Mass. 265, 270 (1992). See, e.g., Massachusetts Fed'n of Teachers v. Board of Educ., 436 Mass. 763, 778 (2002) (equal protection); Coffee-Rich, Inc. v. Commissioner of Pub. Health, 348 Mass. 414, 422 (1965) (due process). Any law failing to satisfy the basic standards of rationality is void.

The plaintiffs challenge the marriage statute on both equal protection and due process grounds. With respect to each such claim, we must first determine the appropriate standard of review. Where a statute implicates a fundamental right or uses a suspect classification, we employ "strict judicial scrutiny." Lowell v. Kowalski, 380 Mass. 663, 666 (1980). For all other statutes, we employ the " 'rational basis' test." English v. New England Med. Ctr., 405 Mass. 423, 428 (1989). For due process claims, rational basis analysis requires that statutes "bear[ ] a real and substantial relation to the public health, safety, morals, or some other phase of the general welfare." Coffee-Rich, Inc. v. Commissioner of Pub. Health, supra, quoting Sperry & Hutchinson Co. v. Director of the Div. on the Necessaries of Life, 307 Mass. 408, 418 (1940). For equal protection challenges, the rational basis test requires that "an impartial lawmaker could logically believe that the classification would serve a legitimate public purpose that transcends the harm to the members of the disadvantaged class." English v. New England Med. Ctr., supra at 429, quoting Cleburne v. Cleburne Living Ctr., Inc., 473 U.S. 432, 452 (1985) (Stevens, J., concurring). [FN20]

The department argues that no fundamental right or "suspect" class is at issue here, [FN21] and rational basis is the appropriate standard of review. For the reasons we explain below, we conclude that the marriage ban does not meet the rational basis test for either due process or equal protection. Because the statute does not survive rational basis review, we do not consider the plaintiffs' arguments that this case merits strict judicial scrutiny.

The department posits three legislative rationales for prohibiting same-sex couples from marrying: (1) providing a "favorable setting for procreation"; (2) ensuring the optimal setting for child rearing, which the department defines as "a two-parent family with one parent of each sex"; and (3) preserving scarce State and private financial resources. We consider each in turn.

The judge in the Superior Court endorsed the first rationale, holding that "the state's interest in regulating marriage is based on the traditional concept that marriage's primary purpose is procreation." This is incorrect. Our laws of civil marriage do not privilege procreative heterosexual intercourse between married people above every other form of adult intimacy and every other means of creating a family. General Laws c. 207 contains no requirement that the applicants for a marriage license attest to their ability or intention to conceive children by coitus. Fertility is not a condition of marriage, nor is it grounds for divorce. People who have never consummated their marriage, and never plan to, may be and stay married. See Franklin v. Franklin, 154 Mass. 515, 516 (1891) ("The consummation of a marriage by coition is not necessary to its validity"). [FN22] People who cannot stir from their deathbed may marry. See G.L. c. 207, § 28A. While it is certainly true that many, perhaps most, married couples have children together (assisted or unassisted), it is the exclusive and permanent commitment of the marriage partners to one another, not the begetting of children, that is the sine qua non of civil marriage. [FN23]

Moreover, the Commonwealth affirmatively facilitates bringing children into a family regardless of whether the intended parent is married or unmarried, whether the child is adopted or born into a family, whether assistive technology was used to conceive the child, and whether the parent or her partner is heterosexual, homosexual, or bisexual. [FN24] If procreation were a necessary component of civil marriage, our statutes would draw a tighter circle around the permissible bounds of nonmarital child bearing and the creation of families by noncoital means. The attempt to isolate procreation as "the source of a fundamental right to marry," post at (Cordy, J., dissenting), overlooks the integrated way in which courts have examined the complex and overlapping realms of personal autonomy, marriage, family life, and child rearing. Our jurisprudence recognizes that, in these nuanced and fundamentally private areas of life, such a narrow focus is inappropriate.

The "marriage is procreation" argument singles out the one unbridgeable difference between same-sex and opposite-sex couples, and transforms that difference into the essence of legal marriage. Like "Amendment 2" to the Constitution of Colorado, which effectively denied homosexual persons equality under the law and full access to the political process, the marriage restriction impermissibly "identifies persons by a single trait and then denies them protection across the board." Romer v. Evans, 517 U.S. 620, 633 (1996). In so doing, the State's action confers an official stamp of approval on the destructive stereotype that same-sex relationships are inherently unstable and inferior to opposite-sex relationships and are not worthy of respect. [FN25]

The department's first stated rationale, equating marriage with unassisted heterosexual procreation, shades imperceptibly into its second: that confining marriage to opposite-sex couples ensures that children are raised in the "optimal" setting. Protecting the welfare of children is a paramount State policy. Restricting marriage to opposite-sex couples, however, cannot plausibly further this policy. "The demographic changes of the past century make it difficult to speak of an average American family. The composition of families varies greatly from household to household." Troxel v. Granville, 530 U.S. 57, 63 (2000). Massachusetts has responded supportively to "the changing realities of the American family," id. at 64, and has moved vigorously to strengthen the modern family in its many variations. See, e.g., G.L. c. 209C (paternity statute); G.L. c. 119, § 39D (grandparent visitation statute); Blixt v. Blixt, 437 Mass. 649 (2002), cert. denied, 537 U.S. 1189 (2003) (same); E.N.O. v. L.M.M., 429 Mass. 824, cert. denied, 528 U.S. 1005 (1999) (de facto parent); Youmans v. Ramos, 429 Mass. 774, 782 (1999) (same); and Adoption of Tammy, 416 Mass. 205 (1993) (coparent adoption). Moreover, we have repudiated the common-law power of the State to provide varying levels of protection to children based on the circumstances of birth. See G.L. c. 209C (paternity statute); Powers v. Wilkinson, 399 Mass. 650, 661 (1987) ("Ours is an era in which logic and compassion have impelled the law toward unburdening children from the stigma and the disadvantages heretofore attendant upon the status of illegitimacy"). The "best interests of the child" standard does not turn on a parent's sexual orientation or marital status. See e.g., Doe v. Doe, 16 Mass.App.Ct. 499, 503 (1983) (parent's sexual orientation insufficient ground to deny custody of child in divorce action). See also E.N.O. v. L.M.M., supra at 829-830 (best interests of child determined by considering child's relationship with biological and de facto same-sex parents); Silvia v. Silvia, 9 Mass.App.Ct. 339, 341 & n. 3 (1980) (collecting support and custody statutes containing no gender distinction).

The department has offered no evidence that forbidding marriage to people of the same sex will increase the number of couples choosing to enter into opposite-sex marriages in order to have and raise children. There is thus no rational relationship between the marriage statute and the Commonwealth's proffered goal of protecting the "optimal" child rearing unit. Moreover, the department readily concedes that people in same-sex couples may be "excellent" parents. These couples (including four of the plaintiff couples) have children for the reasons others do--to love them, to care for them, to nurture them. But the task of child rearing for same-sex couples is made infinitely harder by their status as outliers to the marriage laws. While establishing the parentage of children as soon as possible is crucial to the safety and welfare of children, see Culliton v. Beth Israel Deaconness Med. Ctr., 435 Mass. 285, 292 (2001), same-sex couples must undergo the sometimes lengthy and intrusive process of second-parent adoption to establish their joint parentage. While the enhanced income provided by marital benefits is an important source of security and stability for married couples and their children, those benefits are denied to families headed by same-sex couples. See, e.g., note 6, supra. While the laws of divorce provide clear and reasonably predictable guidelines for child support, child custody, and property division on dissolution of a marriage, same-sex couples who dissolve their relationships find themselves and their children in the highly unpredictable terrain of equity jurisdiction. See E.N.O. v. L.M.M., supra. Given the wide range of public benefits reserved only for married couples, we do not credit the department's contention that the absence of access to civil marriage amounts to little more than an inconvenience to same-sex couples and their children. Excluding same-sex couples from civil marriage will not make children of opposite-sex marriages more secure, but it does prevent children of same-sex couples from enjoying the immeasurable advantages that flow from the assurance of "a stable family structure in which children will be reared, educated, and socialized." Post at (Cordy, J., dissenting). [FN26]

No one disputes that the plaintiff couples are families, that many are parents, and that the children they are raising, like all children, need and should have the fullest opportunity to grow up in a secure, protected family unit. Similarly, no one disputes that, under the rubric of marriage, the State provides a cornucopia of substantial benefits to married parents and their children. The preferential treatment of civil marriage reflects the Legislature's conclusion that marriage "is the foremost setting for the education and socialization of children" precisely because it "encourages parents to remain committed to each other and to their children as they grow." Post at (Cordy, J., dissenting).

In this case, we are confronted with an entire, sizeable class of parents raising children who have absolutely no access to civil marriage and its protections because they are forbidden from procuring a marriage license. It cannot be rational under our laws, and indeed it is not permitted, to penalize children by depriving them of State benefits because the State disapproves of their parents' sexual orientation.

The third rationale advanced by the department is that limiting marriage to opposite-sex couples furthers the Legislature's interest in conserving scarce State and private financial resources. The marriage restriction is rational, it argues, because the General Court logically could assume that same-sex couples are more financially independent than married couples and thus less needy of public marital benefits, such as tax advantages, or private marital benefits, such as employer-financed health plans that include spouses in their coverage.

An absolute statutory ban on same-sex marriage bears no rational relationship to the goal of economy. First, the department's conclusory generalization-- that same-sex couples are less financially dependent on each other than opposite-sex couples--ignores that many same-sex couples, such as many of the plaintiffs in this case, have children and other dependents (here, aged parents) in their care. [FN27] The department does not contend, nor could it, that these dependents are less needy or deserving than the dependents of married couples. Second, Massachusetts marriage laws do not condition receipt of public and private financial benefits to married individuals on a demonstration of financial dependence on each other; the benefits are available to married couples regardless of whether they mingle their finances or actually depend on each other for support.

The department suggests additional rationales for prohibiting same-sex couples from marrying, which are developed by some amici. It argues that broadening civil marriage to include same-sex couples will trivialize or destroy the institution of marriage as it has historically been fashioned. Certainly our decision today marks a significant change in the definition of marriage as it has been inherited from the common law, and understood by many societies for centuries. But it does not disturb the fundamental value of marriage in our society.

Here, the plaintiffs seek only to be married, not to undermine the institution of civil marriage. They do not want marriage abolished. They do not attack the binary nature of marriage, the consanguinity provisions, or any of the other gate-keeping provisions of the marriage licensing law. Recognizing the right of an individual to marry a person of the same sex will not diminish the validity or dignity of opposite-sex marriage, any more than recognizing the right of an individual to marry a person of a different race devalues the marriage of a person who marries someone of her own race. [FN28] If anything, extending civil marriage to same-sex couples reinforces the importance of marriage to individuals and communities. That same-sex couples are willing to embrace marriage's solemn obligations of exclusivity, mutual support, and commitment to one another is a testament to the enduring place of marriage in our laws and in the human spirit. [FN29]

It has been argued that, due to the State's strong interest in the institution of marriage as a stabilizing social structure, only the Legislature can control and define its boundaries. Accordingly, our elected representatives legitimately may choose to exclude same-sex couples from civil marriage in order to assure all citizens of the Commonwealth that (1) the benefits of our marriage laws are available explicitly to create and support a family setting that is, in the Legislature's view, optimal for child rearing, and (2) the State does not endorse gay and lesbian parenthood as the equivalent of being raised by one's married biological parents. [FN30] These arguments miss the point. The Massachusetts Constitution requires that legislation meet certain criteria and not extend beyond certain limits. It is the function of courts to determine whether these criteria are met and whether these limits are exceeded. In most instances, these limits are defined by whether a rational basis exists to conclude that legislation will bring about a rational result. The Legislature in the first instance, and the courts in the last instance, must ascertain whether such a rational basis exists. To label the court's role as usurping that of the Legislature, see, e.g., post at (Cordy, J., dissenting), is to misunderstand the nature and purpose of judicial review. We owe great deference to the Legislature to decide social and policy issues, but it is the traditional and settled role of courts to decide constitutional issues. [FN31]

The history of constitutional law "is the story of the extension of constitutional rights and protections to people once ignored or excluded." United States v. Virginia, 518 U.S. 515, 557 (1996) (construing equal protection clause of the Fourteenth Amendment to prohibit categorical exclusion of women from public military institute). This statement is as true in the area of civil marriage as in any other area of civil rights. See, e.g., Turner v. Safley, 482 U.S. 78 (1987); Loving v. Virginia, 388 U.S. 1 (1967); Perez v. Sharp, 32 Cal.2d 711 (1948). As a public institution and a right of fundamental importance, civil marriage is an evolving paradigm. The common law was exceptionally harsh toward women who became wives: a woman's legal identity all but evaporated into that of her husband. See generally C.P. Kindregan, Jr., & M.L. Inker, Family Law and Practice §§ 1.9 and 1.10 (3d ed.2002). Thus, one early Nineteenth Century jurist could observe matter of factly that, prior to the abolition of slavery in Massachusetts, "the condition of a slave resembled the connection of a wife with her husband, and of infant children with their father. He is obliged to maintain them, and they cannot be separated from him." Winchendon v. Hatfield, 4 Mass. 123, 129 (1808). But since at least the middle of the Nineteenth Century, both the courts and the Legislature have acted to ameliorate the harshness of the common-law regime. In Bradford v. Worcester, 184 Mass. 557, 562 (1904), we refused to apply the common-law rule that the wife's legal residence was that of her husband to defeat her claim to a municipal "settlement of paupers." In Lewis v. Lewis, 370 Mass. 619, 629 (1976), we abrogated the common-law doctrine immunizing a husband against certain suits because the common-law rule was predicated on "antediluvian assumptions concerning the role and status of women in marriage and in society." Id. at 621. Alarms about the imminent erosion of the "natural" order of marriage were sounded over the demise of antimiscegenation laws, the expansion of the rights of married women, and the introduction of "no-fault" divorce. [FN32] Marriage has survived all of these transformations, and we have no doubt that marriage will continue to be a vibrant and revered institution.

We also reject the argument suggested by the department, and elaborated by some amici, that expanding the institution of civil marriage in Massachusetts to include same-sex couples will lead to interstate conflict. We would not presume to dictate how another State should respond to today's decision. But neither should considerations of comity prevent us from according Massachusetts residents the full measure of protection available under the Massachusetts Constitution. The genius of our Federal system is that each State's Constitution has vitality specific to its own traditions, and that, subject to the minimum requirements of the Fourteenth Amendment, each State is free to address difficult issues of individual liberty in the manner its own Constitution demands.

Several amici suggest that prohibiting marriage by same-sex couples reflects community consensus that homosexual conduct is immoral. Yet Massachusetts has a strong affirmative policy of preventing discrimination on the basis of sexual orientation. See G.L. c. 151B (employment, housing, credit, services); G.L. c. 265, § 39 (hate crimes); G.L. c. 272, § 98 (public accommodation); G.L. c. 76, § 5 (public education). See also, e.g., Commonwealth v. Balthazar, 366 Mass. 298 (1974) (decriminalization of private consensual adult conduct); Doe v. Doe, 16 Mass.App.Ct. 499, 503 (1983) (custody to homosexual parent not per se prohibited).

The department has had more than ample opportunity to articulate a constitutionally adequate justification for limiting civil marriage to opposite-sex unions. It has failed to do so. The department has offered purported justifications for the civil marriage restriction that are starkly at odds with the comprehensive network of vigorous, gender-neutral laws promoting stable families and the best interests of children. It has failed to identify any relevant characteristic that would justify shutting the door to civil marriage to a person who wishes to marry someone of the same sex.

The marriage ban works a deep and scarring hardship on a very real segment of the community for no rational reason. The absence of any reasonable relationship between, on the one hand, an absolute disqualification of same-sex couples who wish to enter into civil marriage and, on the other, protection of public health, safety, or general welfare, suggests that the marriage restriction is rooted in persistent prejudices against persons who are (or who are believed to be) homosexual. [FN33] "The Constitution cannot control such prejudices but neither can it tolerate them. Private biases may be outside the reach of the law, but the law cannot, directly or indirectly, give them effect." Palmore v. Sidoti, 466 U.S. 429, 433 (1984) (construing Fourteenth Amendment). Limiting the protections, benefits, and obligations of civil marriage to opposite-sex couples violates the basic premises of individual liberty and equality under law protected by the Massachusetts Constitution.

Here, no one argues that striking down the marriage laws is an appropriate form of relief. Eliminating civil marriage would be wholly inconsistent with the Legislature's deep commitment to fostering stable families and would dismantle a vital organizing principle of our society. [FN34] We face a problem similar to one that recently confronted the Court of Appeal for Ontario, the highest court of that Canadian province, when it considered the constitutionality of the same-sex marriage ban under Canada's Federal Constitution, the Charter of Rights and Freedoms (Charter). See Halpern v. Toronto (City), 172 O.A.C. 276 (2003). Canada, like the United States, adopted the common law of England that civil marriage is "the voluntary union for life of one man and one woman, to the exclusion of all others." Id. at, quoting Hyde v. Hyde, [1861-1873] All E.R. 175 (1866). In holding that the limitation of civil marriage to opposite- sex couples violated the Charter, the Court of Appeal refined the common-law meaning of marriage. We concur with this remedy, which is entirely consonant with established principles of jurisprudence empowering a court to refine a common-law principle in light of evolving constitutional standards. See Powers v. Wilkinson, 399 Mass. 650, 661-662 (1987) (reforming the common-law rule of construction of "issue"); Lewis v. Lewis, 370 Mass. 619, 629 (1976) (abolishing common-law rule of certain interspousal immunity).

We construe civil marriage to mean the voluntary union of two persons as spouses, to the exclusion of all others. This reformulation redresses the plaintiffs' constitutional injury and furthers the aim of marriage to promote stable, exclusive relationships. It advances the two legitimate State interests the department has identified: providing a stable setting for child rearing and conserving State resources. It leaves intact the Legislature's broad discretion to regulate marriage. See Commonwealth v. Stowell, 389 Mass. 171, 175 (1983).

In their complaint the plaintiffs request only a declaration that their exclusion and the exclusion of other qualified same-sex couples from access to civil marriage violates Massachusetts law. We declare that barring an individual from the protections, benefits, and obligations of civil marriage solely because that person would marry a person of the same sex violates the Massachusetts Constitution. We vacate the summary judgment for the department. We remand this case to the Superior Court for entry of judgment consistent with this opinion. Entry of judgment shall be stayed for 180 days to permit the Legislature to take such action as it may deem appropriate in light of this opinion. See, e.g., Michaud v. Sheriff of Essex County, 390 Mass. 523, 535-536 (1983).

So ordered.

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