[Stultis]

Yet another possiblity re homosexuality is that it's a linked trait. It may not be adapative, may even be maladaptive in itself, but closely associated with some trait that IS adaptive. Let's say (just as a merely illustrative "for instance") that the genetic factors associated with homosexuality only actually cause homosexuality 25 percent of the time; the other 75 percent of the time they cause individuals to have greater empathy with the opposite sex, and a much improved "fashion sense," both of which qualities make bearers of the "homo factor" more successful in securing mates and reproducing. Clearly such a set of factors might be transmitted and even favored by reproduction and natural selection.

[Doctor Stochastic]

On the other hand, non-breeders may be helpful to breeders by aiding them in producing more offspring. Worker bees don't breed but they gather.

[rootkidslim]

Consider this possible Darwinian irony, that whatever genetic component there is for homosexuality, they are less fit in a society that allows them to freely identify and act upon their preferences. In a more "repressive" society they are forced to hide their orientation and participate in reproductive activity in biologically viable ways. I'm sure Gregory Bateson would have fun with that idea.