The intelligent homosexual’s guide to natural selection and evolution, with a key to many complicating factors

I’m going to consider how same-sex attraction might persist in human populations in the face of its apparent selective disadvantages. In the absence of direct data—such as systematic measures of the total evolutionary fitness of gay men or lesbians in specific societal contexts—it’s easy to make up stories about natural selection, but much harder to determine which stories reflect reality. I’ll try to delineate which stories fit with what we know about how selection works, and with the little data we do have—but that’s the best I can do. If there’s one point I hope you take from all that follows, it’s that evolution is complicated, and human evolution doubly so.