Physical attraction attachment styles and dating development

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One measure of infidelity among couples is the frequency of children secretly conceived with a different partner, leading to "non-paternities".Such covertly illegitimate children amount to about 1–2% of newborns in studied populations.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 is more marriage-aged men to marriage-aged women.

Rates of infidelity among women are thought to increase with age.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.

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