Nobody gets out of love alive. You turn into a menace or a pest when you've been rejected.

There were real reasons that you were attracted to somebody originally. The brain doesn't pick willy-nilly. Unless you part ways hating each other for some reason, that mechanism could get triggered again. You can literally fall in love again.

Both sexes like the exercise and challenge of sports, but for men it's also a basic display behavior for impressing and winning a mate.

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.

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

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.

Neither gender is routinely more jealous - although women are more willing to work to win back a lover, while men tend to flaunt their money and status and are more likely to walk out to protect their self-esteem or save face.