I think it is the influences around us that make people decide that lifestyle. From an evolutional standpoint which demands survival and productivity, I do not believe we are "born" gay. If we were then the species is being culled off. We're meant to multiply, in regards to evolution. *Has read a few part of Darwin's book. In terms of Christianity, I don't believe people are born that way, either, because scriptures in both new and old state it is a "perversion." There may be fat genes, but I don't believe there are homosexual genes. If genes could count for our every notion, then am I to then assume that there's a Goth gene, or an Emo one, or a jock one (not sure on this one), a vore gene, a polygamy gene, etc?
Do I hate homosexuals? No. I hate the sin, not the sinner. I don't view them with contempt because we all sin, constantly, from pride, to vanity, to lust, to vengeance, to greed, etc. My dislike of sin spreads to everyone equally, myself included. That's pretty much why I now view both political parties with contempt. *I don't mean to seem off-topic.
Also, I know people who believed they were born gay, but then greatly changed their minds. How is that explained?