Women have never been as interesting as they are now. Not at any time on this planet have women been so educated, so interesting, so capable.

Women are naturally prone to compete over their mates.

We evolved in a tropical climate where the smells of plants and flowers were all around us. We spent a lot of time in the trees with a lot of sunlight and no clothes.

Real competition can drive up testosterone, which boosts libido.

When chimps threaten, they open their mouth and show their teeth. It's a little like waving a knife in front of you. It's very primitive, and therefore bizarre.

When you massage someone, the levels of oxytocin go up in the brain, and oxytocin is one of the chemicals that drives attachment.

It's in our genes, we were built to wander.