Research shows that couples who have a lot of similarities, including intellectual compatibility, end up staying together.

From my studies of genetics and neuroscience I have come to believe that people fall into four broad personality types - each influenced by a different brain chemical: I call them the Explorer, Builder, Director, and Negotiator.

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.

There's biology in everything, even when you're feeling spiritual.

We spend our lives trying to get along with people so we can keep our jobs, keep our marriages together, so that we can raise our kids properly.

People compose poetry, novels, sitcoms - for love.

Romantic love is an addiction: a perfectly wonderful addiction when it's going well, and a perfectly horrible addiction when it's going poorly.