Falling in love was not really a choice; it just struck me.

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

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

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.

When you massage someone, the levels of oxytocin go up in the brain, and oxytocin is one of the chemicals that drives attachment.

Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.

I think romantic love evolved to enable you to focus your mating energy on just one individual at a time, thereby conserving mating time and energy.