Good-looking people are always looking for other good-looking people.

Any kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.

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.

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

Men couldn't care less if your strands are perfectly styled and neat. In fact, he might like you more with some wildness or bedhead, since it shows you're carefree and relaxed.

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.

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