Infidelity is as old as monogamous relationships, and it tempts and plagues even the healthiest couples. Read on to discover 42 truths about a primal and mysterious human condition that has likely touched every relationship in one way or another.
42. Biologically Speaking
Of all the mammals on earth, only 3% are monogamous. Humans can count themselves among this group—for the most part. Interestingly, our closest genetic relatives, primates, are not monogamous.
41. Sudden Coital What?!
Men who cheat are more likely to suffer from a heart attack, or “sudden coital death,” during the affair, as the man is usually in an unfamiliar setting and in a heightened emotional and physical state.
40. Definitely a Downside
Straight men with larger penises are actually more likely to be cheated on by their wives. In one study, for every inch Kenyan men had on their genitals, their likelihood of being cheated on rose by 150%.
39. I Listen to Everything but Rap and Country
In one survey, 42% of cheaters claimed that rock n’ roll music was their favorite genre. Only 2% of rap fans, 3% of gospel fans, and 7% of classical music fans in the survey were cheaters.
38. Shopping Spree
Affair website Ashley Madison found that the most popular stores for cheating women who want to look good for their lover were J. Crew, Ann Taylor, and Macy’s.
37. Side Benefits?
Cheaters often become more sexually active in their longterm relationship during their affair, taking advantage of the new spark in their sexual life.
36. Positive Reinforcement
The most common reasons for not cheating? Morality, the effects on any children from the union, the fear of remaining alone, and the effects on other people.
35. Deep Trouble
Male spouses who have deep voices are more likely to be suspected of cheating. The same is true for female spouses with high voices.
34. What a Flirt
When straight men flirt with other women, they become more intolerant of any transgressions by their partner. When straight women flirt with other men, however, they become more tolerant of slip-ups.
33. How About Them Odds
In over one third of marriages, one or both partners confess he or she has cheated.
32. Mars v Venus
22% of men have said that they have cheated on their significant other, while 14% of women have confessed to cheating on their significant other.
31. Once a Cheater, Always a Cheater?
Men and women who have been unfaithful before are 350% more inclined to cheat again than those who haven’t. Yikes. Talk about breaking a seal.
30. Just Getting Started
The most likely time for an affair to arise? Two years into marriage. This is around the time couples start to settle down, build a family, and forge a life together. In other words, it’s a time where romance can take the back seat.
29. Out of Sight, Out of Mind
Business trips set the scene for infidelity to occur. About 35% of men and women admit to cheating on a partner while away for work.
28. Late Night Delivery
Overall, business is bad: common projects, late nights, and long hours spent together make it so that 85% of affairs start in the workplace.
27. Stay in School
Statistically, high school dropouts are more likely to be unfaithful.
26. Sugar Daddies Left Behind
Another vulnerable group are couples where one spouse is earning much less than the other spouse. Men who depend on their wives for financial support, in particular, are scientifically more likely to step out. 5% of financially dependent women cheat as opposed to 15% of financially dependent men.
25. More is Less
It’s not all great for women looking for a Sugar Daddy, though. Although in general the more money men earn relative to their spouse, the less likely they are to be unfaithful, this stops once men reach the threshold of bringing in 70% of the household income. At this point, men become as likely to cheat as before.
24. More Money, No Problems
There’s no downside for boss women: Women with a higher income bracket than their spouses are also less likely to stray and they are likely to remain equally faithful no matter what their income is relative to their spouses.
23. Lucky Number 9
Men whose ages end in the number 9 are the ones most actively seeking a little something-something on the side, particularly if they are about to turn 40 or 50. This could very well be their last chance to potentially have a romance outside of their relationship.
22. The Top Three
Desire. Love. Appreciation: These tend to be the traits that the “other woman” provides the cheating man that his wife, from his perspective, doesn’t.
21. Your Stairwell or Mine?
Of the hospital cases of fractured penises, an estimated half of these injuries occurred during an extramarital affair. As with “sudden coital death,” researchers theorize that this overrepresentation is a result of extra excitement while engaging in sexual positions, often in small and awkward places. No word on how many male cheaters suffered from fractured penises AND sudden coital death.
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42. Biologically Speaking
Of all the mammals on earth, only 3% are monogamous. Humans can count themselves among this group—for the most part. Interestingly, our closest genetic relatives, primates, are not monogamous.

41. Sudden Coital What?!
Men who cheat are more likely to suffer from a heart attack, or “sudden coital death,” during the affair, as the man is usually in an unfamiliar setting and in a heightened emotional and physical state.

40. Definitely a Downside
Straight men with larger penises are actually more likely to be cheated on by their wives. In one study, for every inch Kenyan men had on their genitals, their likelihood of being cheated on rose by 150%.

39. I Listen to Everything but Rap and Country
In one survey, 42% of cheaters claimed that rock n’ roll music was their favorite genre. Only 2% of rap fans, 3% of gospel fans, and 7% of classical music fans in the survey were cheaters.

38. Shopping Spree
Affair website Ashley Madison found that the most popular stores for cheating women who want to look good for their lover were J. Crew, Ann Taylor, and Macy’s.

37. Side Benefits?
Cheaters often become more sexually active in their longterm relationship during their affair, taking advantage of the new spark in their sexual life.

36. Positive Reinforcement
The most common reasons for not cheating? Morality, the effects on any children from the union, the fear of remaining alone, and the effects on other people.

35. Deep Trouble
Male spouses who have deep voices are more likely to be suspected of cheating. The same is true for female spouses with high voices.

34. What a Flirt
When straight men flirt with other women, they become more intolerant of any transgressions by their partner. When straight women flirt with other men, however, they become more tolerant of slip-ups.

33. How About Them Odds
In over one third of marriages, one or both partners confess he or she has cheated.

32. Mars v Venus
22% of men have said that they have cheated on their significant other, while 14% of women have confessed to cheating on their significant other.

31. Once a Cheater, Always a Cheater?
Men and women who have been unfaithful before are 350% more inclined to cheat again than those who haven’t. Yikes. Talk about breaking a seal.

30. Just Getting Started
The most likely time for an affair to arise? Two years into marriage. This is around the time couples start to settle down, build a family, and forge a life together. In other words, it’s a time where romance can take the back seat.

29. Out of Sight, Out of Mind
Business trips set the scene for infidelity to occur. About 35% of men and women admit to cheating on a partner while away for work.

28. Late Night Delivery
Overall, business is bad: common projects, late nights, and long hours spent together make it so that 85% of affairs start in the workplace.

27. Stay in School
Statistically, high school dropouts are more likely to be unfaithful.

26. Sugar Daddies Left Behind
Another vulnerable group are couples where one spouse is earning much less than the other spouse. Men who depend on their wives for financial support, in particular, are scientifically more likely to step out. 5% of financially dependent women cheat as opposed to 15% of financially dependent men.

25. More is Less
It’s not all great for women looking for a Sugar Daddy, though. Although in general the more money men earn relative to their spouse, the less likely they are to be unfaithful, this stops once men reach the threshold of bringing in 70% of the household income. At this point, men become as likely to cheat as before.

24. More Money, No Problems
There’s no downside for boss women: Women with a higher income bracket than their spouses are also less likely to stray and they are likely to remain equally faithful no matter what their income is relative to their spouses.

23. Lucky Number 9
Men whose ages end in the number 9 are the ones most actively seeking a little something-something on the side, particularly if they are about to turn 40 or 50. This could very well be their last chance to potentially have a romance outside of their relationship.

22. The Top Three
Desire. Love. Appreciation: These tend to be the traits that the “other woman” provides the cheating man that his wife, from his perspective, doesn’t.

21. Your Stairwell or Mine?
Of the hospital cases of fractured penises, an estimated half of these injuries occurred during an extramarital affair. As with “sudden coital death,” researchers theorize that this overrepresentation is a result of extra excitement while engaging in sexual positions, often in small and awkward places. No word on how many male cheaters suffered from fractured penises AND sudden coital death.

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