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Convenience samples do not accurately reflect the population of the United States as a whole, which can cause serious biases in survey results.

multiple marriages but only one legal spouse at a time.

The term monogamy is used to describe for different relationships.

Biologists, biological anthropologists, and behavioral ecologists often use the term monogamy in the sense of sexual, if not genetic, monogamy.

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Many reports of extrapair paternity are little more than quotes based on hearsay, anecdotes, and unpublished findings.

Human monogamy's legal aspects are taught at faculties of law.

There are also philosophical aspects in the field of interest of e.g.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.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.Three studies have used nationally representative samples.