When chimps threaten, they open their mouth and show their teeth. It's a little like waving a knife in front of you. It's very primitive, and therefore bizarre.

You've got to remember that men are men and women are women. And although a lot of similarities, there are some real differences.

Games are the way we keep romance alive. They're based in human hardwiring. Playing hard-to-get or leaving a little to the imagination allows the woman to be wooed and appreciated and the man to be challenged and intrigued.

Until recently, we regarded love as supernatural. We were willing to study the brain chemistry of fear and depression and anger but not love.

You don't come home from the office to spend time with another job. Hopefully you come home to someone you can have a good time with.

Women, it turns out, are built to lead - particularly in the modern world.

People have been looking for love potions since hunter-gatherer societies.