I also saw the mention of Sex at Dawn in Savage Love and was intrigued. Great post, and I'm looking forward to reading the future ones. I wish I could vote this up more than once.

I'm wondering how this line of thinking would deal with studies that look at human behavior in many different cultures: I know that David Buss in particular has done some survey studies using cultures all over the world, suggesting that social norms don't have much to do with male/female differences in sexuality.