Why do we feel jealousy? Therapists often regard the demon as a scar of childhood trauma or a symptom of a psychological problem. And it's true that people who feel inadequate, insecure, or overly dependent tend to be more jealous than others.

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.

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

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

Real competition can drive up testosterone, which boosts libido.

Romantic love is not an emotion. ... It's a drive. It comes from the motor of the mind, the wanting part of the mind, the craving part of the mind.

Office romances are few, short, and not usually destructive.