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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.

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.

These differences have been generally thought due to evolutionary pressures that motivate men towards sexual opportunity and women towards commitment to one partner.

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

Support for this theory comes from evidence showing higher divorce rates in countries with lower sex ratios and higher monogamy rates in countries with higher sex ratios.

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