According to the survey, 15 percent of women and 16 percent of men with children ages 2 to 5 years had an affair. An unexpected 7 percent of women and 9 percent of men cheated while there was a baby under the age of 2 in the home. It also appears that money doesn’t buy marital happiness. For men with money, infidelity is just another perk. Among men making more than $300,000 a year, 32 percent report cheating, compared to 21 percent of men making less than $35,000 a year. Wealth isn't much of a factor in women's cheating.
http://www.nbcnews.com/id/17951664/ns/health-sexual_health/t/many-cheat-thrill-more-stay-true-love/
1 5 percent of married men and 3 percent of married women reported having sex with someone other than their spouse in the year1997. 2  22 percent of men and 14 percent of women admitted to having sexual relations outside their marriage sometime in their past.  90 percent of Americans believe adultery is morally wrong.
http://menstuff.org/issues/byissue/infidelitystats.html
1 22 percent of married men have strayed at least once during their married lives. 2  14 percent of married women have had affairs at least once during their married lives.  Younger people are more likely candidates; in fact, younger women are as likely as younger men to be unfaithful.
http://menstuff.org/issues/byissue/infidelitystats.html
Marriage Infidelity Statistics. Percent of marriages where one or both spouses admit to infidelity, either physical or emotional. Percent of men who admit to committing infidelity in any relationship they’ve had. Percentage of women who admit to committing infidelity in any relationship they’ve had.
http://www.statisticbrain.com/infidelity-statistics/
But many did face lingering feelings of sadness (25 percent), stress (32 percent) and guilt (49 percent). The only thing that turned out from cheating was feelings of guilt and shame, writes a 31-year-old woman who is currently single.
http://www.nbcnews.com/id/17951664/ns/health-sexual_health/t/many-cheat-thrill-more-stay-true-love/
Most married people don’t cheat. In a 1991 study, sex researcher Shere Hite found that 70 percent of married women have cheated on their partners; a 1993 follow-up study found that 72 percent of married men have as well. According to a 2004 University of Chicago study, 25 percent of married men have had at least one extramarital affair. And with more than 12 million members looking for extramarital intimacy on Web site AshleyMadison.com (tagline: “Life is short. Have an affair.”), it’s easier than ever to break marriage vows.
https://www.washingtonpost.com/opinions/five-myths-about-cheating/2012/02/08/gIQANGdaBR_story.html
1 5 percent of married men and 3 percent of married women reported having sex with someone other than their spouse in the year1997.  22 percent of men and 14 percent of women admitted to having sexual relations outside their marriage sometime in their past.
http://menstuff.org/issues/byissue/infidelitystats.html
Estimates today find married men cheating at rates between 25 percent and 72 percent. Given that many people are loath to admit that they cheat, research on cheating may underestimate its prevalence. But it appears that cheating is as common as fidelity.
https://www.washingtonpost.com/opinions/five-myths-about-cheating/2012/02/08/gIQANGdaBR_story.html
1 70 percent of married women and 54 percent of married men did not know of their spouses' extramarital activity.  5 percent of married men and 3 percent of married women reported having sex with someone other than their spouse in the year1997.
http://menstuff.org/issues/byissue/infidelitystats.html
1 14 percent of married women have had affairs at least once during their married lives. 2  Younger people are more likely candidates; in fact, younger women are as likely as younger men to be unfaithful.  70 percent of married women and 54 percent of married men did not know of their spouses' extramarital activity.
http://menstuff.org/issues/byissue/infidelitystats.html
percentage of married women who cheat
The percentage of married women who cheat is 14 percent. 14 percent of married women cheats.