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.

There exists no culture in which adultery is unknown, no cultural device or code that extinguishes philandering.

You've got to remember that men are men and women are women. And although a lot of similarities, there are some real differences.

We're apt to fall in love with those who are mysterious and challenging to us.

A hundred years ago, if you had a child out of marriage, you'd be a social disgrace. Today women feel comfortable enough economically and culturally to bring up a child without a recognized commitment from a man.

You don't come home from the office to spend time with another job. Hopefully you come home to someone you can have a good time with.

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