In America, we are demanding everything from our marriage.

Today, American women bear an average of 2.2 children that live to adulthood. Across most of Europe, women bear even fewer young.

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.

That "ol' black magic" is a fickle force. The chemistry of romantic love can trigger the chemistry of sexual desire and the fuel of sexual desire can trigger the fuel of romance. This is why it is dangerous to copulate with someone with whom you don't wish to become involved. Although you intend to have casual sex, you might just fall in love.

People compose poetry, novels, sitcoms - for love.

Experiences shape the brain, but the brain shapes the way we view experiences, too.

Women like signs of money and education - things that indicate that not only is this guy going to have some resources, but he's also willing to share them.