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}}</ref> Excision of the foreskin by [[circumcision]] necessarily reduces the pleasurable sensations emanating from the [[foreskin]].

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As a developmental neuropsychologist I have devoted a great deal of study to the peculiar relationship between violence and pleasure. I am now convinced that the deprivation of physical sensory pleasure is the principal root cause of violence. Laboratory experiments with animals show that pleasure and violence have a reciprocal relationship, that is, the presence of one inhibits the other. A raging, violent animal will abruptly calm down when electrodes stimulate the pleasure centers of its brain. Likewise, stimulating the violence centers in the brain can terminate the animal's sensual pleasure and peaceful behavior. When the brain's pleasure circuits are 'on,' the violence circuits are 'off,' and vice versa. Among human beings, a pleasure-prone personality rarely displays violence or aggressive behaviors, and a violent personality has little ability to tolerate, experience, or enjoy sensuously pleasing activities. As either violence or pleasure goes up, the other goes down.<ref>{{REFjournal

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