"Now, men and women are working together as equals, with a lot of intellectual energy and common interests," Glass said. "It's a combination of emotional and sexual bonds. And it's more dangerous because it creates an alternative to the marriage, rather than just a supplement."
Still, being equal in some ways hasn't erased the differences in why men and women cheat, some experts say.
"Men have affairs to boost their self-esteem and because it's available. Their feelings are closely tied to their sexuality and potency," Brooklyn psychologist Marcella Bakur Weiner said. "Women don't just want a night of joy and pleasure. No matter what the feminists say, women want love. They want emotional attachment and bonding."
The Secret Lives of Wives
When groups of women get together, especially if they're mothers and have been married for more than six or seven years, and especially if there's alcohol involved, the conversation is usually the same. They talk about the kids and work -- how stressed they are, how busy and bone tired. They gripe about their husbands and, if they're being perfectly honest and the wine kicks in, they talk about the disappointments in their marriages. Not long ago, over lunch in Los Angeles, this conversation took a surprising turn, when Erin, who is in her early 40s and has been married for more than a decade, spilled it. She was seeing someone else. Actually, more than one person. It started with an old friend, whom she began meeting every several months for long dinners and some heavy petting. Then she began giving herself permission to flirt with, kiss -- well, actually, make out with -- men she met on business trips. She understands it's a "Clintonian" distinction, but she won't have sex with anyone except her husband, whom she loves. But she also loves the unexpected thrill of meeting someone new. "Do you remember?" She pauses. "I don't know how long you've been married, but do you remember the kiss that would just launch a thousand kisses?"
Erin started seeing other men when she went back to work after her youngest child entered preschool. All of a sudden she was out there. Wearing great clothes, meeting new people, alive for the first time in years to the idea that she was interesting beyond her contributions at PTA meetings. Veronica, on the other hand, fell in love with a man who was not her husband while she was safely at home in the Dallas suburbs looking after her two children. Hers is the more familiar story: isolated and lonely, married to an airline pilot, Veronica, now 35, took up with a wealthy businessman she met at a Dallas nightclub. Her lover gave her everything her husband didn't: compliments, Tiffany jewelry, flowers and love notes. It was, in fact, the flowers that did her in. Veronica's lover sent a bouquet to her home one afternoon, her husband answered the door and, in one made-for-Hollywood moment, the marriage was over. Now remarried (to a new man), Veronica says she and her friends half-jokingly talk about starting a Web site for married women who want to date. "I think there might be a market in it," she says. There is. Wives who want extramarital sex -- or are just dreaming about it -- can find what they seek on Yahoo!, MSN or AOL.
Much has changed since Emma Bovary chose suicide with arsenic over living her life branded an adulteress.humiliated, impoverished and stripped of her romantic ideals. In the past, U.S. laws used to punish women who cheated; in a divorce, an unfaithful wife could lose everything, even the property she owned before marriage. Newer laws have been designed to protect these women. The reality is this: American women today have more opportunity to fool around than ever; when they do fool around, they're more likely to tell their friends about it, and those friends are more likely to lend them a sympathetic ear. They probably use technology to facilitate their affairs, and if they get caught, they're