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.

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Differences in sexual infidelity as a function of gender have been commonly reported.

It is more common for men compared to women to engage in extradyadic relationships.

On the other hand, when people live within environments that encompass little stress and threats to the viability of offspring, the need for serious and committed relations is lowered and therefore promiscuity and infidelity are more common.

Sex ratio theory is a theory that explains the relationship and sexual dynamics within different areas of the world based on the ratio of the number of marriage-aged men to marriage-aged women.

In addition, recent research finds that differences in gender may possibly be explained by other mechanisms including power and sensations seeking.

For example, one study found that some women in more financially independent and higher positions of power, were also more likely to be more unfaithful to their partners.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".Rates of infidelity among women are thought to increase with age.In one study by Blow, rates were higher in more recent marriages, compared with previous generations. From the new year to February 14th, there are more people dating online than any other time of the year.