Ummm evolution requires procreation.
There is one possibility, that is that somehow guys who are straight but have homosexual tendencies are procreating more, and that somehow, homosexual tendencies result in more gay gene offspring. This would make sense as men who are more feminine usually dress better, take better care of themselves, and are generally regarded by women as desirable partners, because douchebags have ruined things for the rest of us.
Anyway, that's a possibility....but it doesn't really hold up to the rest of the animal kingdom. Gay animals don't look any more attractive to the opposite sex. Yet gay animals persist regardless of their attractiveness, and gay offspring are still being born to hetero parents.
The fact of the matter is that everyone is wired differently. I have proof that gay people are natural because people like Einstein were born. People like Edison, people like Ted Bundy, people like Attila the Hun, people like Usain Bolt.
Wtf prof, what are you talking about?
I'm saying that the human race is what it is because every person is made very differently from each other. We are NATURALLY created to accomplish many different things as an entire species. Rainman, for example, cannot function in an adult way but can count how many matches were in a box that fell on the floor in a second.
Everyone is different, that's just how it is. We are WIRED intrinsically to do things that ON AVERAGE we shouldn't be able to do.