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

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.

You fall in love with somebody who fits within what I call your 'love map,' an unconscious list of traits that you build in childhood as you grow up. And I also think that you gravitate to certain people, actually, with somewhat complementary brain systems.

The reason you take antidepressants is to feel calm. And romantic love is not calm -it's elation, it's mood swings, and you're killing all that when you take the drug.

Psychologists maintain that the dizzy feeling of intense romantic love lasts only about 18 months to-at best-three years

Men have a psychological need to show off their courage and strength. When he sees you talking to another guy, that instinct kicks in and he jumps to protect you and prove he's worthy of your love.

Falling in love was not really a choice; it just struck me.