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Strategic pluralism is a theory that focuses on how environmental factors influence mating strategies.

According to this theory, when people live within environments that are demanding and stressful, the need for bi-parental care is greater for increasing the survival of offspring.

One measure of infidelity among couples is the frequency of children secretly conceived with a different partner, leading to "non-paternities".

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Depending on the context, men and women can experience social consequences if their act of infidelity becomes public.

The form and extent of these consequences are often dependent on the gender of the unfaithful person.

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.

These findings suggest there may be various factors that might influence the likelihood of some individuals to engage in extradyadic relationships, and that such factors may account for observed gender differences beyond actual gender and evolutionary pressures associated with each.

In that study which involved 19,065 people during a 15-year period, rates of infidelity among men were found to have risen from 20 to 28%, and rates for women, 5% to 15%.

A survey conducted in 1990 found 2.2% of married participants reported having more than one partner during the past year.Results, however, vary year by year, and also by age-group surveyed.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.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.According to this theory, an area has a high sex ratio when there is a higher number of marriage-aged women to marriage-aged men and an area has a low sex ratio when there are more marriage-aged men.Infidelity (synonyms include: cheating, adultery (when married), netorare (NTR), being unfaithful, or having an affair) is a violation of a couple's assumed or stated contract regarding emotional and/or sexual exclusivity.

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