Homosexuality

I say that it's a mental disorder mainly caused by your surroundings. After all, if someone with the same genes as you can be attracted to the opposite gender and you can't, doesn't that guarentee that somewhere along the way, you mind was tweaked by your surroundings? I've heard that there's about a 50% chance of one twin to be g'ay if the other is, and that's for two reasons: they have the same genes, and they have very similar environments (this is probably the more important factor).

You are assuming that there is no possible biological (not genetic) basis for homosexuality.

This sounds a little pessimistic, but I'd say the relatively recent influx of contraceptives is increasing the population of g'ays: you don't have sex to have kids anymore, you have sex to feel good. Therefore, homosexuals don't break too many norms when they have sex with each other.

You lost me here. Seems like a huge slippery slope.