The Third Chimpanzee: the Evolution and Future of the Human Animal - Study Guide Chapter 4, The Science of Adultery Summary & Analysis

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Several scientifically rigorous genetic investigations of large populations conclusively demonstrate that roughly 10 percent of human children are not the genetic children of the male parent whom assumes genetic relatedness - in other words, about 10 percent of children are not genetically related to their putative "biological" father; thus, secretive extra-marital sexual unions are in fact exceptionally common among couples who self-identify as exclusively monogamous. Many of these scientific studies were never published because their conclusions were deemed too inflammatory.

For evolutionary reasons, extra-marital sex is approached differently by men than by women. Men can supposedly enjoy extra-marital sex with a minimum of consequences because an impregnated secondary sexual partner can simply be abandoned. On the other hand, women must be highly selective in extra-marital sexual partners to avoid compromise or disclosure. These differing goals are considered...

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