Jealousy can even be good for love. One partner may feel secretly flattered when the other is mildly jealous. And catching someone flirting with your beloved can spark the kind of lust and romance that reignites a relationship.

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.

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

For so many generations, a woman's only career path was to marry well and to marry up. Those days have changed.

Nobody gets out of love alive. You turn into a menace or a pest when you've been rejected.

Young women today do not marry the men they met in high school, or even the one they go out with at college, because they do not need to.

The only people you and I are likely to know in common are people in the news - politicians, journalists and celebrities.