HELEN FISHER

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

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

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.

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

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.

In that early-love stage, you're in that state of exhilaration. You talk till dawn. You become obsessed with 'What does he think?' 'Does he like me?' 'Does he think I'm fat?'

I was married and divorced at 23.

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.

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.

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.

More and more of us live segmented, compartmentalized lives. This isn't natural. For millions of years, our forebears knew everyone around them and everyone knew them.

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

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

There exists no culture in which adultery is unknown, no cultural device or code that extinguishes philandering.

Men and women are like two feet; they can help each other get ahead.

I have always been interested in how you can walk into a room and there will be 40 people there and you are immediately drawn to one.

It certainly would have been adaptive for ancestral man to have a chubby wife during stressful times of famine. Not only would she have had more calories to burn, and thus more energy and endurance, but since fat stores estrogen, she would have remained fertile for longer.

When somebody leaves Match.com or Chemistry.com, they ask you why you left. One box you can check is, 'I found somebody.' Between 15 and 20 percent of people check that box.

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

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.

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

Globalization requires taking a broad contextual and long-term view.

In America, we are demanding everything from our marriage.

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.

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.