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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.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.
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".
Frequencies as high as 30% are sometimes assumed in the media, but research Such studies show that covert illegitimacy is in fact less than 10% among the sampled African populations, less than 5% among the sampled Native American and Polynesian populations, less than 2% of the sampled Middle Eastern population, and generally 1–2% among European samples.
Strategic pluralism is a theory that focuses on how environmental factors influence mating strategies.
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.