Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.

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.

A Rolex watch or an expensive car are the things guys often use to show status, wealth, and basic desirability.

There are cognitive processes and limbic reactions associated with basic emotions. And you can change brain chemistry, but you're still not going to change memories and experiences in a human being.

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

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

Romantic love is one of the most addictive substances on Earth.