There's more than one person on the planet. When you're madly in love, that's not what you think.

I was married and divorced at 23.

You can be instantly scared. You can be instantly happy. So why can't you be instantly romantically in love? I think when it happens, it's because you are ready to fall in love.

Experiences shape the brain, but the brain shapes the way we view experiences, too.

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

Every time you cuddle with your children, you're likely to be driving down your testosterone.

Women apparently are quite drawn to men who have differences rather than similarities in their histocompatibility system. They pick it up by smell, and they can pick it up from kissing.

If we remained perpetually infatuated, we couldn't eat, sleep or work.

We're not very dangerous animals; we don't have a horn like a rhino or quills like a porcupine.

It's almost as if men who get tribal tattoos are trying to signal that they are dangerous, they're to be respected, and they're powerful.

Any time you choose not to hide your tattoo, you're limiting your social sphere, because they're not popular in big business.

Your face and head give more information about you than any other body part.

People compose poetry, novels, sitcoms - for love.

Whether you're married or not, relationships - and the satisfaction tied to them - are extremely important for increasing men's and women's quality of life.

You don't come home from the office to spend time with another job. Hopefully you come home to someone you can have a good time with.

Barriers tend to intensify romance. It's called the 'Romeo and Juliet effect.' I call it 'frustration attraction.'

Games are the way we keep romance alive. They're based in human hardwiring. Playing hard-to-get or leaving a little to the imagination allows the woman to be wooed and appreciated and the man to be challenged and intrigued.

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.

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.

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

Men fall in love faster than, and just as often as, women.

Sometimes we fall in love with somebody who will probably never love us, for reasons having nothing to do with us but with their own mindset, their chemistry.

We spend our lives trying to get along with people so we can keep our jobs, keep our marriages together, so that we can raise our kids properly.

Throughout evolution, ostracism was death indeed.

Love is not an emotion; it is a drive.

Psychologists maintain that the dizzying feeling of intense romantic love lasts only about 18 months to - at best - three years.

The brain was not built to walk into a bar, where you know nobody, and start a conversation. That's not the way humanity has courted.

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

Haiti is the poorest country in the western hemisphere; some say the poorest in the world.

As societies continue to loosen their standards regarding what is appropriate female and male behavior, I think we are going to realize we have not only underestimated women, but also men.

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

I suspect privacy is a very new concept to humanity.

Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.

Today, American women bear an average of 2.2 children that live to adulthood. Across most of Europe, women bear even fewer young.

Neither gender is routinely more jealous - although women are more willing to work to win back a lover, while men tend to flaunt their money and status and are more likely to walk out to protect their self-esteem or save face.

Most of us make up our minds in the first three minutes of meeting someone whether there's a potential for a relationship.

In general, men are wired to notice obvious signs that convey interest in mating - a warm smile, for example - and ignore other subtleties, like if your lipstick is faded.

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.

As a group, anthropologists are not too fond of people who work in the business world.

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

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.