Of all the foods we share, there is nothing more primordial than meat. It's no surprise that meat-eaters still want a partner who will give, receive and share this primordial symbol of a budding partnership.

The women's movement is just a symptom of basic changes in the economy that are favoring women.

I've always maintained that men were more romantic than women.

The Internet lets women use words, which is their natural tool. Little girls speak in more complex, grammatical sentences than little boys do, and women never lose that superiority in verbal ability.

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

We all have restlessness in long-term relationships.

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.

We still have community, but we don't seem to have local community. Even in a small town where you know your neighbors and your mother's down the street, they're not in arm's length.

Like most animals, we're wired to associate height with power.

In courtship, who wins and who loses will determine who passes on their DNA to tomorrow.

A woman of 40 or 50 or 60 can take estrogen replacements, get facelifts, spend her money in bars.

We're apt to fall in love with those who are mysterious and challenging to us.

If two very different people pool their DNA, they'll create more genetic variety, and their young will come to the job of parenting with a wider array of skills.

When you can't have someone but you're not willing to accept that, you try harder and become more extreme about it. Either you win the person back or you drive him away.

Women have a better sense of smell than men do, and it's even sharper in the middle of their menstrual cycle, when estrogen levels peak and women are more likely to be deciding whether a man's attractive.

Women like signs of money and education - things that indicate that not only is this guy going to have some resources, but he's also willing to share them.

Touch is the mother of the senses. Not only are women more sensitive when they touch, but they're also more sensitive to being touched.

Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.

Almost always, when I'm on TV, the producers who call me, who negotiate what we're going to say, is a woman.

I think the happiness we find, we make.

You fall in love with somebody who fits within what I call your 'love map,' an unconscious list of traits that you build in childhood as you grow up. And I also think that you gravitate to certain people, actually, with somewhat complementary brain systems.

People have often asked me whether what I know about love has spoiled it for me. And I just simply say, 'Hardly.' You can know every single ingredient in a piece of chocolate cake, and then when you sit down and eat that cake, you can still feel that joy.

From my studies of genetics and neuroscience I have come to believe that people fall into four broad personality types - each influenced by a different brain chemical: I call them the Explorer, Builder, Director, and Negotiator.

We are wired to find love.

Women, it turns out, are built to lead - particularly in the modern world.

You size up someone physically in less than one second - too tall, too short, too fat, too thin, too old, too young, too stuffy, too scruffy.

Women are very attracted to a low voice because it's linked to testosterone, which for millions of years was a sign that men had very good spacial skills and would have been very good at hunting and finding their way back home.

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.