Cheating (relationship)

Infidelity (also referred to as cheating, adultery (when married), being unfaithful, or having an affair) is a violation of a couple's assumed or stated contract regarding emotional and/or sexual exclusivity. Other scholars define infidelity as a violation according to the subjective feeling that one's partner has violated a set of rules or relationship norms; this violation results in feelings of sexual jealousy and rivalry.

What constitutes an act of infidelity depends upon the exclusivity expectations within the relationship. In marital relationships, exclusivity expectations are commonly assumed although they are not always met. When they are not met, research has found that psychological damage can occur, including feelings of rage and betrayal, lowering of sexual and personal confidence, and damage to self-image. Depending on the context, men and women can experience social consequences if their act of infidelity becomes public. The form and extent of these consequences are often dependent on the gender of the unfaithful person.

One measure of infidelity among couples is the frequency of children secretly conceived with a different partner, leading to "non-paternities". Such covertly illegitimate children amount to about 1–2% of newborns in European populations.

After the Kinsey Reports came out in the early 1950s, findings suggested that historically and cross-culturally, extramarital sex has been a matter of regulation more than sex before marriage. The Kinsey Reports found that around half of men and a quarter of women studied had committed adultery. The Janus Report on Sexual Behavior in America also reported that one third of married men and a quarter of women have had an extramarital affair.

According to The New York Times, the most consistent data on infidelity comes from the University of Chicago's General Social Survey (GSS). Interviews with people in non-monogamous relationships since 1972 by the GSS have shown that approximately 12% of men and 7% of women admit to having had an extramarital relationship. Results, however, vary year by year, and also by age-group surveyed. For example, one study conducted by the University of Washington, Seattle found slightly, or significantly higher rates of infidelity for populations under 35, or older than 60. In that study which involved 19,065 people during a 15-year period, rates of infidelity among men were found to have risen from 20 to 28%, and rates for women, 5% to 15%. In more recent nationwide surveys, several researchers found that about twice as many men as women reported having an extramarital affair. A survey conducted in 1990 found 2.2% of married participants reported having more than one partner during the past year. In general, national surveys conducted in the early 1990s reported that between 15-25% of married Americans reported having extramarital affairs. Treas and Giesen found that people who had stronger sexual interests, more permissive sexual values, lower subjective satisfaction with their partner, weaker network ties to their partner, and greater sexual opportunities were more likely to be unfaithful. Studies suggest around 30–40% of unmarried relationships and 18–20% of marriages see at least one incident of sexual infidelity.

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