Young women today do not marry the men they met in high school, or even the one they go out with at college, because they do not need to.

Most of us make up our minds in the first three minutes of meeting someone whether there's a potential for a relationship.

We still have community, but we don't seem to have local community. Even in a small town where you know your neighbors and your mother's down the street, they're not in arm's length.

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

Men want to think women don't cheat, and women want men to think they don't cheat, and therefore the sexes have been playing a little psychological game with each other.

Today, American women bear an average of 2.2 children that live to adulthood. Across most of Europe, women bear even fewer young.

The brain was not built to walk into a bar, where you know nobody, and start a conversation. That's not the way humanity has courted.