Biology of Sexual Orientation

This is a topic that scares a lot of people on both sides but this is a good article on the subject.

First, I'll confess to my own position on that nature-nurture debate: it's both and it's neither, and the argument is misplaced. There is no template on the Y chromosome that triggers a sexual response when Pamela Anderson enters the visual field, but there almost certainly are general predispositions that are a product of genetics, development, and learning. Even if there were no genetic component at all, it shouldn't matter in social policy or in our interactions with other people: my own heterosexuality is fairly strongly fixed and was acquired before I was really aware of it, and I'm willing to see other's homosexuality, no matter what its source, as equally fixed, and changing it as both undesirable and unjust.

Thanks PZ.