I don't really believe in the "born gay" theory. I just don't. I had an attraction for girls during elementary and some of middle, but around high school, I started noticing boys more than girls. I find dudes more attractive than girls nowadays. My opinion is that it just happens. I highly doubt it's a choice. I mean...who would choose to be gay? We get ridiculed, bashed, killed, assaulted...a heavy price for liking the same sex, unlike our straight counterparts. Plus, if we just "chose" our sexuality, wouldn't that mean were all just bisexual and have the ability to switch back and forth between straight and gay? It's laughable really...
No fully straight guy is going to switch to dudes and no fully gay man is going to switch to women just like that. I feel like it's just what your attracted to really....we can't help who were attracted to or who we fall in love with. Whether it's a man or a woman, then so be it, you like what you like. There are some cases where your environment and certain situations in life can influence you greatly, but I feel like that doesn't apply to everyone.