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.

Oh, my. They gave each of us our own shopping cart to push around, and we left with enough clothes to fill two suitcases and a duffel bag. We just picked out the sizes we wanted. We were like kids in a candy store.

Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.

We spent a lot of time in simulators. We were going to do it right.

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.