I have a theory that homosexual behaviour has been constant throughout our history. Imagine being a tribal man mid war with all sorts of tension building up inside, it's probably evolutionarily useful to manage to fuck another man (or whatever's close, for that manner) to let some of that steam out. Same goes for women, they needed to let some steam out while men were away and one of the viable alternatives was horsing around with other women.

Once we became more civilized that started fading out and what we're seeing now is a mixture of genetic shit and fashion. Bisexual women and men along with gays who want direct descendants are responsible for the spead of genetic material, that's also part of the reason why there are families where there is an abundance of homosexuals and why twins have almost a 50/50 chance of engaging in such behavious if the other is, even if they were separated from birth. In a sense, heterosexuality is more evolved than any other sexual preference because it no longer serves any real biological purpose other than hedonistic pleasure seeking. I don't hate gays though, they just annoy me when they start getting around spreading liberal ideas because it's the only ideology that actively endorses whatever it is they can think of. The only difference between deviant taboo sexualities and homosexualism is that being gay doesn't actively harm anyone any more than being heterosexual does, which is good, aside from that, it's all just different steam release mechanisms.

In conclusion, it's pointless to be homophobic, it's just the natural course of things, it's like getting mad because the wind blows of because things fall down. It's just the way nature is, it was a necesary step for the survival of our species.