In courtship, who wins and who loses will determine who passes on their DNA to tomorrow.

What our grandmothers told us about playing hard to get is true. The whole point of the game is to impress and capture. It's not about honesty. Many men and women, when they're playing the courtship game, deceive so they can win. Novelty, excitement and danger drive up dopamine in the brain. And both sexes brag.

Both sexes like the exercise and challenge of sports, but for men it's also a basic display behavior for impressing and winning a mate.

If we remained perpetually infatuated, we couldn't eat, sleep or work.

We're not very dangerous animals; we don't have a horn like a rhino or quills like a porcupine.

Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.

I think that property is very important in this day and age. It defines you; you worked hard to get it. It's meaningful to you, and when you divorce, a lot of people have a lot of battles over their property for good reasons.