Any kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.

Any kind of novelty or excitement drives up dopamine in the brain, and dopamine is associated with romantic love.

Scientists know that women gravitate to men who have a different immune system from theirs.

Blushing is thought to be linked to increased levels of norepinephrine in the brain, which may be associated with romantic feelings. It signals that we are interested and excited, which is attractive to men.

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 fight, anger drives up testosterone in both men and women.

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.