Although I haven't read everything (and well, what I read was speed reading... I mean, it's late and there is a LOT here... *cute puppy eyes*), I can safely say that I'm gay.
I had a female partner about 2.5 years ago, had sex with her, and well... yeah... that's about it, really...
And now, I have a boyfriend with whom I've been with for the past 2 years in october, and well, I have to admit, bed sports are WAY better with someone of the same sex so far!
I beleive that it's just a part of nature. A small number of individuals are just "like that", animals or humans. I haven't done lenghty researches, but from what I remember of my biology class when we talked about homosexuality, "it just is". It's not a illment, it's not a "mental disorder", it "just is", like heterosexuality.
And I think I should be lucky to live in Montreal, where the gay community i rather well accepted (well, as far as I'm concerned with my own experiences...)