You've got to remember that men are men and women are women. And although a lot of similarities, there are some real differences.

I can't conceive of caring more about my president than my own partner.

Games are the way we keep romance alive. They're based in human hardwiring. Playing hard-to-get or leaving a little to the imagination allows the woman to be wooed and appreciated and the man to be challenged and intrigued.

Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.

As women in industrial societies join the paid workforce, they gain the economic means to depart unhappy marriages more easily.

The Great Depression of the 1930s saw more American unmarried women working from nine to five, mostly in repetitive, boring, subordinate, dead-end jobs. But the number of working women doubled between 1870 and 1940. During World War II it doubled once again.

Romantic love allows you to focus mating energy. Attachment sustains that relationship as long as necessary to raise your baby.