Infidelity has been a reality across cultures. But this brain architecture makes it biologically possible to express deep feelings of attachment for one partner, while one feels intense romantic love for another individual, while one feels the sex drive for even more extra-dyadic partners.Ĥ. These three basic neural systems interact with one another and other brain systems in myriad flexible, combinatorial patterns to provide the range of motivations, emotions and behaviors necessary to orchestrate our complex human reproductive strategy. 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. Human beings have three primary brain systems related to love. Brain architecture may contribute to infidelity. “ Serial monogamy and clandestine adultery: Evolution and consequences of the dual human reproductive strategy,” by Helen Fisher in Applied Evolutionary Psychologyģ.The Social Organization of Sexuality, by Edward Laumann, John Gagnon, Robert Michael and Stuart Michaels.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. However, monogamy is only part of the human reproductive strategy. Marriage, a History, by Stephanie CoontzĢ.More recent data indicates that some 85% of Americans will eventually marry. Data from the Demographic Yearbooks of the United Nations on 97 societies between 19 indicate that approximately 93.1% of women and 91.8% of men marry by age 49. Here Fisher explains more about cheating - why it occurs, how common it is and how a study shows it could potentially correlate to a gene.ġ. It’s those other two systems that explain why human beings are capable of infidelity even as we so highly value love. Love isn’t so much an emotion, says biological anthropologist Helen Fisher, as it is a brain system, one of three that’s related to mating and reproduction.
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