I definitely don't think homosexuality is a choice, however, it is equally absurd to think it is caused by a gene, because I'm pretty sure a "gay" gene would die out rather quickly.
I don't buy the argument that homosexuality is entirely genetic, but this logic doesn't really track -- there are plenty of fatal genetic diseases that survive in the genepool. Even if homosexuality were relegated to one gene, things would be a lot more complicated than just "gay gene->automatically gay->no reproduction." Each of those stages is inaccurate. And, even if homosexuality is purely genetic, it would be unlikely to involve only one gene, making your claim against homosexuality being purely genetic even weaker. (Again, I don't think it is purely genetic; my point is just about genetics.)
Obviously it's a complicated issue. The one thing I can say for certain myself, is that it was not a choice. Given the anxiety and trouble my sexuality has caused me growing up, had I had a choice, I would have chosen otherwise.
But it wasn't my choice. I am emotionally, romantically, and physically attracted to men. But it's probably not the same as a woman's attraction to men, either. Because I am still a man. So it is different.
The claim that homosexuality is genetic is probably only a part of the equation, at best. It seems more logical that there is a critical time during pregnancy in which sexuality is "wired" into the brain. This probably provides a basis for heterosexuality, homosexuality, bisexuality, and the various other sexualities.
Beyond this, it is probably environmental and cultural. I don't think it'd be inappropriate to assume that there are people out there that might naturally be bisexual, but come to prefer one gender over the other through environmental and cultural factors. Many might feel pressured to suppress their homosexual desires and thus only seek out heterosexual relationships (which they find fulfilling because they are also attracted to the opposite sex).
There just seems to be a lot of gray area.
But again, the only thing I can say for certain, at least for myself, is.. by the time I became aware of my sexuality at all, I knew I was attracted to guys. It's not as if I started getting off to boobies and then decided "let's corrupt guys instead!!!"
And to Tj: The Catholic church is not infallible. There are numerous priests/monks who vehemently disagree with the official positions of the church regarding homosexuality and want to see the policies changed. And they don't believe this because they are corrupt. They believe this because they believe the church's interpretation of the Bible regarding the issue is wrong and needs to be revisited. A church can be grounded in tradition and still evolve. And the church can be flat out wrong as well.
Please don't have children until you can accept them for who they are. By interfering with something as base as their sexuality in the way you suggested earlier in this thread, you are causing major psychological harm. You don't have to like the behavior, but you do have to love your child and you do have to try and understand them. That is just common sense.
