Of all the foods we share, there is nothing more primordial than meat. It's no surprise that meat-eaters still want a partner who will give, receive and share this primordial symbol of a budding partnership.

Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.

People compose poetry, novels, sitcoms - for love.

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.

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

Like most animals, we're wired to associate height with power.

Hair that looks like it's been naturally sun-bleached makes you seem youthful, like you spend a lot of time outdoors. And that appeals to most people.