Kissing is not just kissing. It is a major escalation or de-escalation point in a powerful process of mate choice.

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.

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

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.

For so many generations, a woman's only career path was to marry well and to marry up. Those days have changed.

In general, men are wired to notice obvious signs that convey interest in mating - a warm smile, for example - and ignore other subtleties, like if your lipstick is faded.

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