Opinion of the Court
Rights, 1973, in 131 Am. J. Psychiatry 497 (1974). Only in more recent years have psychiatrists and others recognized that sexual orientation is both a normal expression of human sexuality and immutable. See Brief for American Psychological Association et al. as Amici Curiae 7–17.
In the late 20th century, following substantial cultural and political developments, same-sex couples began to lead more open and public lives and to establish families. This development was followed by a quite extensive discussion of the issue in both governmental and private sectors and by a shift in public attitudes toward greater tolerance. As a result, questions about the rights of gays and lesbians soon reached the courts, where the issue could be discussed in the formal discourse of the law.
This Court first gave detailed consideration to the legal status of homosexuals in Bowers v. Hardwick, 478 U. S. 186 (1986). There it upheld the constitutionality of a Georgia law deemed to criminalize certain homosexual acts. Ten years later, in Romer v. Evans, 517 U. S. 620 (1996), the Court invalidated an amendment to Colorado’s Constitution that sought to foreclose any branch or political subdivision of the State from protecting persons against discrimination based on sexual orientation. Then, in 2003, the Court overruled Bowers, holding that laws making same-sex intimacy a crime “demea[n] the lives of homosexual persons.” Lawrence v. Texas, 539 U. S. 558, 575.
Against this background, the legal question of same-sex marriage arose. In 1993, the Hawaii Supreme Court held Hawaii’s law restricting marriage to opposite-sex couples constituted a classification on the basis of sex and was therefore subject to strict scrutiny under the Hawaii Constitution. Baehr v. Lewin, 74 Haw. 530, 852 P. 2d 44. Although this decision did not mandate that same-sex marriage be allowed, some States were concerned by its implications and reaffirmed in their laws that marriage is
