Hear the voice of science about gays?

Every now and again, another pro-gay person goes behind the mountain to retrieve scientific proof that being gay is genetic, aka "natural", and they cannot help it.

Almost inevitably they discover the research done by LeVay and Hamer and use that as positive proof that gays are that way due to their genes. However, both LeVay and Hamer have been debunked and their research doesn't hold much water.

Anyway, here are two posts as an introduction in that direction:
The gene and homosexuality
The gene and homosexuality - the sequel