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The rates of extrapair paternity ranged from 0.03% to 11.8% although most of the locations had low percentages of extrapair paternity. A separate review of 17 studies by Bellis, Hughes, Hughes, and Ashton found slightly higher rates of extrapair paternity.
The rates varied from 0.8% to 30% in these studies, with a median rate of 3.7% extrapair paternity.
A range of 1.8% to 3.7% extrapair paternity implies a range of 96% to 98% genetic monogamy.
Although the incidence of genetic monogamy may vary from 70% to 99% in different cultures or social environments, a large percentage of couples remain genetically monogamous during their relationships.
The amount of extramarital sex by women is described as "universal" in 6 cultures, "moderate" in 23 cultures, "occasional" in 9 cultures, and "uncommon" in 15 cultures.
A study of sexual behavior in Thailand, Tanzania and Côte d'Ivoire suggests about 16–34% of men engage in extramarital sex while a much smaller (unreported) percentage of women engage in extramarital sex.It should not be surprising, therefore, that surveys of extramarital sex in the United States have produced widely differing results.These studies report that about 12–26% of married women and 15–43% of married men engage in extramarital sex.That study was funded by the National Institute of Mental Health.However, the Human Rights Campaign has stated, based on a Rockway Institute report, that "GLBT young people...