Scientists know that women gravitate to men who have a different immune system from theirs.

When you're in the throes of this romantic love, it's overwhelming - you're out of control, you're irrational, you're going to the gym at 6 A.M. every day - Why? Because she's there.

Psychologists maintain that the dizzy feeling of intense romantic love lasts only about 18 months to-at best-three years

People have been looking for love potions since hunter-gatherer societies.

Sometimes we fall in love with somebody who will probably never love us, for reasons having nothing to do with us but with their own mindset, their chemistry.

It certainly would have been adaptive for ancestral man to have a chubby wife during stressful times of famine. Not only would she have had more calories to burn, and thus more energy and endurance, but since fat stores estrogen, she would have remained fertile for longer.

The human brain is built to compare; it's Darwinian to consider an alternative when one presents itself.