Hot cave wall porn?
LOL! Of course that does not definitively resolve the question, or else we wouldn't be having this debate. As I said earlier, it is "powerful" evidence against, but not definitive.
Look, this is my final answer to this debate! It's OK with me if people want to fantasize hot cave sex between Cro-Magnons and Neandertals. It really is. I think it flies in the face of not just genetic research but of human sociology as well. But if someone wants to think it happened that is OK by me.
Hot cave wall porn?