http://www.statisticbrain.com/infidelity-statistics/
Infidelity Statistics
Statistic Verification
Source: Associated Press, Journal of Marital and Family Therapy
Research Date: 1.1.2014
Marriage Infidelity Statistics Data
Percent of marriages where one or both spouses admit to infidelity, either physical or emotional 41 %
Percent of men who admit to committing infidelity in any relationship they’ve had 57 %
Percentage of women who admit to committing infidelity in any relationship they’ve had 54 %
Percent of married men who have strayed at least once during their married lives 22 %
Percent of married women who have strayed at least once during their married lives 14 %
Percentage of men and women who admit to having an affair with a co-worker 36 %
Percentage of men and women who admit to infidelity on business trips 35%
Percentage of men and women who admit to infidelity with a brother-in-law or sister-in-law 17 %
Average length of an affair 2 years
Percentage of marriages that last after an affair has been admitted to or discovered 31 %
Percentage of men who say they would have an affair if they knew they would never get caught 74 %
Percentage of women who say they would have an affair if they knew they would never get caught 68 %
Percent of children who are the product of infidelity 3 %
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In the gaze of the other 
Interesting how many of the percentages for both sexes are so close.
Interesting how infidelity seems to be stitched into the fabric of our lives. Some normalize the behavior, and for those against infidelity, they may have to share their lives with someone who innately has no issues with it. Very interesting findings here. I wonder how they gathered this data. I will check out the link to find out.
This site on which this info bit was taken proclaims to do only statistics, and I looked around a bit to verify credibility. I visited other sites before settling on this one for its signs of credibility. The findings are thought provoking, revealing, but yes, a statistic is mere magic until the methodology behind it is verified. However, the findings are not too different from other 2014 statistics I found on the subject.
An interesting study –
http://www.encyclopedia.com/topic/Infidelity.aspx
An excerpt-
Permissive sexual values reflect liberal religious and political ideologies. Men are more permissive than women. People with more schooling are more tolerant than people with less education. African Americans and people who live in big cities are also more tolerant of extramarital sex. Not surprisingly, people with permissive sexual values are more likely to have adulterous relationships. Only 10 percent of U.S. respondents who say extramarital sex is “always wrong” report having extramarital sex, as compare to 76 percent of respondents who say extramarital sex is “not at all wrong” (Smith 1994).
I came up as a single musician who was more or less expected to have more than one, more often than not the girls knowing each other and okay with the arrangement…. ah, the good old days….. I never had to suffer the slings and arrows of definition by disaster.
I would be interested to see the infidelity stats from 1994 to compare. Next project.