>>2409484well it's possible that genetics can alter hormone levels on their own, but if that was true we'd probably see some kind of predictable trend in which types of individuals end up gay.
So far, the only real correlation that can be observed is between homosexuality and hormone levels. I read a while ago that gays are more likely to have their index and middle fingers be nearly the same length (for both men and women). Obviously genes control finger length, but it's also controlled by hormones. I think going at the genetic angle is implying causation with a mere correlation.