Anthropologists have found evidence of romantic love in 170 societies. They've never found a society that did not have it.

People have often asked me whether what I know about love has spoiled it for me. And I just simply say, 'Hardly.' You can know every single ingredient in a piece of chocolate cake, and then when you sit down and eat that cake, you can still feel that joy.

Young women today do not marry the men they met in high school, or even the one they go out with at college, because they do not need to.

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

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.

At first I assumed hate was the opposite of love. But it isn't. The opposite of love is indifference.

Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.