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However, monogamy is only part of the human reproductive strategy. Current studies of American couples indicate that 20 to 40% of heterosexual married men and 20 to 25% of heterosexual married women will also have an extramarital affair during their lifetime. 1) The sex drive evolved to motivate individuals to seek copulation with a range of partners; 2) romantic love evolved to motivate individuals to focus their mating energy on specific partners, thereby conserving courtship time and metabolic energy; 3) partner attachment evolved to motivate mating individuals to remain together at least long enough to rear a single child through infancy together. Researchers have broadened the definition of infidelity to include sexual infidelity (sexual exchange with no romantic involvement), romantic infidelity (romantic exchanges with no sexual involvement) and sexual and romantic involvement. Myriad psychological, cultural and economic variables play a role in the frequency and expression of infidelity. In a recent survey of single American men and women, 60% of men and 53% of women admitted to “mate poaching,” trying to woo an individual away from a committed relationship to begin a relationship with them instead. Regardless of the correlation between relationship dissatisfaction and adultery, among individuals engaging in infidelity in one study, 56% of men and 34% of women rated their marriage as “happy” or “very happy,” suggesting that genetics may also play a role in philandering. Studies show the possibility of a gene that correlates to infidelity.
Infidelity had unconscious biological payoffs for both males and females throughout prehistory, thus perpetuating the biological underpinnings and taste for infidelity in both sexes today.
Maybe you think fidelity is something people can cultivate over time?
”(Sure, but I mean, who would want an ugly, broke jerk sticking faithfully by their side?
“What tends to matter for females is that the overall package is good," meaning that women might accept a less-attractive mate if he was outstanding in some other way.
"Online, this might result in males restricting their potential mates.”is two decades old, but new, fast-growing apps such as Tinder have shifted the online-matching emphasis back to looks.