Due to the fact that i wish to do other things in my lifetime i havent read the whole thread, but most of it.
I dont think anybody has pointed out (correct me if im wrong) that there is a part of the brain that is sexually specific?
I think it is smaller in Females than males, allthough in some cases, Gays, Lesbians, Transvestites and transexuals, it is the wrong size.
So technically we can quantify 'gayness', although unless people are totally truthful, it is difficult to observate.