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

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.

You can really get poked in the back and not feel it very much, but just a feather around your lips and you really do feel it.

Haiti is the poorest country in the western hemisphere; some say the poorest in the world.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.

There's biology in everything, even when you're feeling spiritual.

There's all kinds of reasons that you fall in love with one person rather than another: Timing is important. Proximity is important. Mystery is important. You fall in love with somebody who's somewhat mysterious, in part because mystery elevates dopamine in the brain, probably pushes you over that threshold to fall in love.