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

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.

When you fight, anger drives up testosterone in both men and women.

Women are very attracted to a low voice because it's linked to testosterone, which for millions of years was a sign that men had very good spacial skills and would have been very good at hunting and finding their way back home.

As a group, anthropologists are not too fond of people who work in the business world.

A woman of 40 or 50 or 60 can take estrogen replacements, get facelifts, spend her money in bars.

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