Real competition can drive up testosterone, which boosts libido.

The main characteristics of romantic love are craving: an intense craving to be with a particular person, not just sexually, but emotionally.

As a group, anthropologists are not too fond of people who work in the business world.

Romantic love is an addiction: a perfectly wonderful addiction when it's going well, and a perfectly horrible addiction when it's going poorly.

We're apt to fall in love with those who are mysterious and challenging to us.

It's almost as if men who get tribal tattoos are trying to signal that they are dangerous, they're to be respected, and they're powerful.

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.