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The amount of extramarital sex by men is described as "universal" in 6 cultures, "moderate" in 29 cultures, "occasional" in 6 cultures, and "uncommon" in 10 cultures.
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.
These studies report that about 12–26% of married women and 15–43% of married men engage in extramarital sex.
The only way to get scientifically reliable estimates of extramarital sex is to use nationally representative samples.
Research by Colleen Hoffon of 566 homosexual male couples from the San Francisco Bay Area found that 45% had monogamous relationships.
That study was funded by the National Institute of Mental Health.
Three studies have used nationally representative samples.
People in some cultures are more sexually monogamous than people in other cultures.
The prevalence of sexual monogamy can be roughly estimated as the percentage of married people who do not engage in extramarital sex.
The Standard Cross-Cultural Sample describes the amount of extramarital sex by men and women in over 50 pre-industrial cultures.
Rates of extrapair paternity have not been extensively studied in people.
Many reports of extrapair paternity are little more than quotes based on hearsay, anecdotes, and unpublished findings.