The boundary between homo- and heterosexuality once stood solidly in our cultural imagination, marked off by a set of assumed differences that were purportedly made manifest in real, material ways. Gays and lesbians, so the story went, were verifiably different from straight people, but gradually, the perceived boundary between the two sexualities has eroded. It has been 30 years since the American Psychological Association cured us of our homosexuality with the stroke of a pen. Despite the enthusiastic application of scientific and statistical technologies, the efforts of researchers such as Dean Hamer, Peter Copeland, and Simon LeVay (just to name a few), have failed to show conclusively that our ears, fingers, brains, or genes actually reveal anything concrete about our choices of sexual partners. Lawrence v. Texas (2003) has knocked down Bowers v. Hardwick (1986) as well as the remaining sodomy laws, expanded the right of privacy to include same-sex sex, and in the wake of Goodridge v. Dept. of Public Health (2003) Massachusetts has begun allowing same-sex couples to marry. In contrast to many European nations, gay and lesbian parents in the United States are winning legal victories with increasing frequency, gaining greater access to adoption and child custody despite jurisdictional variation. For that diminishing segment of the population that still desperately wants a clear marker of its sexual superiority the news is not good. Fortunately for them, heterosexuals still have one clearly identifiable social sanctuary where they can remind themselves that they have something that non-heterosexuals do not: marriage. With a minimum of effort and expense, one man and one woman can enter into a relationship with the state that brings about numerous legal benefits, obligations, and privileges. Despite some advances, marriage thus stands as one of the last clearly exclusive, forcefully bounded, brightly illuminated enclaves where gays and lesbians may not tread; it remains for heterosexuals only (or at least, for those who want to appear that way).