This article is from New York Magazine and it that explores biological evidence that people are born gay and do not become gay because of bad parenting, childhood trauma or because they enjoy being persecuted by self-righteous religious fanatics. It's a long article , but worth reading.
The Science of Gaydar
I'm sure more evidence will eventually prove the idea that sexual orientation is genetic, or created in the birth process, and not a choice. I'm also sure the fanatics of the world will dismiss the science (as usual) and hold on to their beliefs in the ramblings of ancient old men - it's so much easier to hate people than to accept the fact that are just different.
That's my "two cents" - what's yours?