Castration decreases sexual urges in the subset of sex offenders with intense, obsessive, and pathological urges. But otherwise castration doesn't decrease recidivism rates; as stated in one meta-analysis, "hostile rapists and those who commit sex crimes motivated by power or anger are not amenable to treatment with {the antiandrogenic drugs}.
( Robert M. Sapolsky )
[ Behave: The Biology of Humans ]
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