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.

We're not very dangerous animals; we don't have a horn like a rhino or quills like a porcupine.

We all have restlessness in long-term relationships.

There exists no culture in which adultery is unknown, no cultural device or code that extinguishes philandering.

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.

Office romances are few, short, and not usually destructive.

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.