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.

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

Experiences shape the brain, but the brain shapes the way we view experiences, too.

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

The reason you take antidepressants is to feel calm. And romantic love is not calm -it's elation, it's mood swings, and you're killing all that when you take the drug.

Women, it turns out, are built to lead - particularly in the modern world.

Young women today do not marry the men they met in high school, or even the one they go out with at college, because they do not need to.