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.

Anthropologists have found evidence of romantic love in 170 societies. They've never found a society that did not have it.

That "ol' black magic" is a fickle force. The chemistry of romantic love can trigger the chemistry of sexual desire and the fuel of sexual desire can trigger the fuel of romance. This is why it is dangerous to copulate with someone with whom you don't wish to become involved. Although you intend to have casual sex, you might just fall in love.

Women apparently are quite drawn to men who have differences rather than similarities in their histocompatibility system. They pick it up by smell, and they can pick it up from kissing.

My hypothesis is that conservative Republicans have very clear values, and when you have that, you're simply more relaxed.

Scientists know that women gravitate to men who have a different immune system from theirs.

Men don't need linguistic talent; they just need courage and words.