The Secret Lives of Wives

"Women always say 'thank you' for that role, and at first I wasn't sure how to take that," says Lane, who adds that the character was capable of far more denial than she could ever be. "I mean, she was cheating and lying. Then I realized it was because she wasn't a victim. She made a choice to have an affair. It's not something you often see."

Where do married women find their boyfriends? At work, mostly. Nearly 60 percent of American women work outside the home, up from about 40 percent in 1964. Quite simply, women intersect with more people during the day than they used to. They go to more meetings, take more business trips and, presumably, participate more in flirtatious water-cooler chatter. If infidelity is an odds game, then the odds are better now than they used to be that a woman will accidentally bump into someone during the workday who, at least momentarily, interests her more than her husband does. There's a more subtle point embedded in here as well: women and men bring their best selves to work, leaving their bad behavior and marital resentments at home with their dirty sweatpants. At work, "we dress nicely. We think before we speak. We're poised," says Elana Katz, a therapist in private practice and a divorce mediator at the Ackerman Institute for the Family in New York City. "And many people spend more time out in the world than with their families. I think sometimes people have the idea that [an affair] will protect the marriage." They get a self-esteem boost during work hours and don't rock the boat at home. "In some paradoxical sense this may be a respite, a little break from the marriage."

"I wasn't out there looking for someone else," says Jodie, 34, a marketing professional in Texas and mother of two. (NEWSWEEK talked at length to more than a dozen women who cheated, and none of them wanted her real name used.) Her continuing affair with a co-worker started innocently enough. She liked his company. "We would go to lunch together and gradually it started feeling like we were dating." At Christmas, Jodie asked her husband of 10 years to join her at the office party, and when he declined, the co-worker stepped in. "We just had so much fun together and we laughed together and it just grew and grew and grew until... he kissed me. And I loved it."

It's not just opportunity that fuels the impulse to be unfaithful; it's money and power as well. American women are better educated than they've ever been. A quarter of them earn more money than their husbands. A paycheck and a 401(k) don't guarantee that a woman will stray, but if she does, they minimize the fallout both for her and for her children. The feminist Gloria Steinem once said, "Most women are one man away from welfare," but she recently amplified her views to NEWSWEEK: "Being able to support oneself allows one to choose a marriage out of love and not just economic dependence. It also allows one to risk that marriage." In other words, as women grow more powerful, they're more likely to feel, as men traditionally have, that they deserve a little bit of nooky at the end (or in the middle) of a long, busy day.

And like their fathers before them, these powerful women are learning to savor the attentions of a companion who is physically attractive but not as rich, successful--or as old--as they are. In his practice in Palo Alto, Calif., family therapist Marty Klein sees a rise in sexual activity between middle-aged women and younger men. "Forty-year-old women have more of a sense of entitlement to their sexuality than they did before the 'Hite Report,' the feminist movement and 'Sex and the City'," he says. A story currently circulating in Manhattan underscores his point. It seems that a group of 6-year-old girls from an elite private school were at a birthday party, and the conversation turned to their mommies' trainers. As the proud mothers listened nearby, one youngster piped up: "My mommy has a trainer, and every time he comes over, they take a nap." The wicked laughter this story elicits illustrates at least what is dreamed of, if not actually consummated.

The road to infidelity is paved with unmet expectations about sex, love and marriage. A woman who is 40 today grew up during the permissive 1970s and went to college when the dangers of AIDS were just beginning to dawn. She was sexually experienced before she was married and waited five years longer than her mother to settle down. She lives in a culture that constantly flaunts the possibility of great sex and fitness well after menopause. "Great Lovers Are Made, Not Born!" read the ads for sex videos in her favorite magazines; "What if the only night sweats you had came from a good workout?" ask the ads for estrogen therapy.