Quote Originally Posted by thir View Post
I do not follow this argument. If our genes were exactly the same as then , we would still look like those bipedals and Darwin with his ideas of slowly but ever changing genes would be all wrong.
No one is saying we are exactly the same now as then. And IF there is a genetic predisposition for homosexuality, there's no reason to think it wouldn't be a more recent mutation, though we know there were homosexuals existing at least in Biblical times, at least for the last 10,000 years. That's an eye-blink in terms of genetic mutation rates, though.

But not all genetic changes need be slow. Environmental stresses, including overcrowding, can speed changes along far more rapidly than previously believed. Still, you're talking many generations to see even small changes. Not something you will see in a single lifetime.