Your sweetheart calls you by another's name. His eyes linger too long on your best friend. He talks with excitement about a girl at work. And the fire catches. Jealousy - that sickening combination of possessiveness, suspicion, rage, and humiliation - can overtake your mind and threaten your very core as you contemplate your rival.

- Helen Fisher

You can get into a very fancy car and know everything about the engine, but when you drive in that car, you feel that rush. In the same way, I think the more you know about love, the more you can enjoy it. And knowing about your personality type, who you are and what kind of person you're dealing with gives you a great leg up.

- Helen Fisher

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

- Helen Fisher

The reason you take antidepressants is to feel calm. And romantic love is not calm - it's elation, it's mood swings, and you're killing all that when you take the drug.

- Helen Fisher

A lot of people head into courtship looking for fireworks. Don't pass up a chance by dumping someone after a first date because you don't feel the fireworks. The fireworks can happen at any time and be maintained.

- Helen Fisher

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

- Helen Fisher

Despite the myth that men are less committed, they are predisposed to desire marriage.

- Helen Fisher

Men have a psychological need to show off their courage and strength. When he sees you talking to another guy, that instinct kicks in and he jumps to protect you and prove he's worthy of your love.

- Helen Fisher

Both sexes like the exercise and challenge of sports, but for men it's also a basic display behavior for impressing and winning a mate.

- Helen Fisher

Until recently, we regarded love as supernatural. We were willing to study the brain chemistry of fear and depression and anger but not love.

- Helen Fisher