mem49er
KAEP
I'm getting in here very late but this comment is odd to me. Isn't the 50% concordance higher than the rate of homosexuality in the general population?If people were genetically predisposed to being gay then if there were identical twins and one were gay then the other would be as well because they have identical DNA / brain structure. Every study I've seen on the subject puts it at about 50% of gay twins also have a gay twin.
Homosexuality: not genetic.