My theory is not full of science mumbo jumbo, so it'll be easy to identify the words.
You know, when you are a little kid, and you like men, and not women? Ok, let's say you go into puberty, with the attraction for the same sex. Let's say that, technically, you haven't grow out of it. The haters, the blamers. They blame ourselves on our attraction to men. Well, have you considered the fact it isn't really our fault. Maybe something went wrong during puberty? Reason for why and what it makes us gay is the question. No, it isn't your background, or your friend that makes you gay. Haven't you consider maybe a movie caused to make you gay? or the media made you gay? Just tossing a another theory.