What Are the Statistics for "once a Cheater, Always a Cheater" Being True?

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Studies differ, but research reveals that 22 percent of people who have cheated do so again, while another study indicates that 55 percent eventually become unfaithful, according to data from Dr. Joy Davidson. A survey comprised of nearly 21,000 men and women showed that 60 percent of men and 50 percent of women said they were unfaithful multiple times.

Dr. Davidson notes that these studies are not concrete and are often contradictory, but these various data points do indicate that cheating is on the rise and more prevalent than many realize. For instance, a 2006 study revealed that 13 percent of married men and 19 percent of married women under the age of 30 have cheated at some point in their lives. This study was compared to a 1991 study that showed 13 percent of men and 11 percent of women of all ages have cheated.

The likelihood of cheating also increases with age, according to various studies. The peak age for cheating is 55 for a man and 45 for a woman. Men in general are seven times more likely to cheat, but women from upper classes are eight times are more likely to be unfaithful than women from middle or working classes.

Dr. Davidson gives various reasons for the rise of infidelity, such as technology and more men and women co-mingling in the workplace.