As women in industrial societies join the paid workforce, they gain the economic means to depart unhappy marriages more easily.

Men couldn't care less if your strands are perfectly styled and neat. In fact, he might like you more with some wildness or bedhead, since it shows you're carefree and relaxed.

A lot of people have been romantically in love with somebody who they feel wasn't appropriate to marry.

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.

[Women] tend to collect more pieces of data when they think, put them into more complex patterns, see more options and outcomes. They tend to be contextual, holistic thinkers.

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

A Rolex watch or an expensive car are the things guys often use to show status, wealth, and basic desirability.