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

Overdone lipstick is a deterrent to men. It rubs off easily onto their skin and the edges of their shirts, so it discourages them from kissing, touching, and coming closer to you, which is what they really want to do!

In courtship, who wins and who loses will determine who passes on their DNA to tomorrow.

It's in our genes, we were built to wander.

We evolved in a tropical climate where the smells of plants and flowers were all around us. We spent a lot of time in the trees with a lot of sunlight and no clothes.

Natural beauty really entices men. They will tell you this time and time again, and studies consistently prove it.

You fall in love with somebody who fits within what I call your 'love map,' an unconscious list of traits that you build in childhood as you grow up. And I also think that you gravitate to certain people, actually, with somewhat complementary brain systems.