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Agreement on the causes of sexual offending has eluded scholars because of an emphasis on studying proximate causes—as with crime in general, there are numerous variables that correlate with sexual offending. A more consilient view of sexual offending includes an evolutionary approach that attempts to answer ultimately why such behavior exists. To guide this research, Camilleri (The Oxford handbook of evolutionary perspectives on violence, homicide, and war, New York, 173–196) proposed a typology of sexual offenders that classifies offending based on two dimensions: (1) whether the behavior is an adaptation, by-product, or disorder and (2) if the mechanism is obligate or facultative. Categories resulting from this typology seem to capture the variability of sexual offending behavior. This chapter mostly reviews evidence of how sexual offending could function as an adaptation, draws links from …