I think the theory I heard about being "a reaction to overpopulation" was actually rather credible and interesting. Might be linked to this study in some way.
Another credible possibility, but definitely not absolute.
Nonetheless I highly doubt your sexuality can be determined at birth. Probably has to do with the excessive hormones released during puberty.
Thats sounds as accurate as bleeding someone to cast out evil spirits.
I'm annoyed that even people who aren't homophobic still think its a choice. Why would people choose to live a life of shame and ridicule?
Please learn to read. When did I ever say homosexuality was a choice? You didn't know at birth you were straight, so it follows that nobody knew at birth that they're gay.