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→Sensitivity and innervation of the glans penis: Wikify.
The results of a fascinating study conducted by Dr. [[Christopher J. Cold]] and Dr. [[Ken McGrath|Kenneth A. McGrath]] demonstrate that the human [[foreskin]] is an evolutionary advancement over the foreskins of other primates. The human [[foreskin]] is far more sophisticated and responsive, as their comparative anatomy studies prove. This is seen most clearly in the evolutionary increase in corpuscular innervation and simultaneous decrease in corpuscular receptors in the human glans relative to the innervation of the foreskin and glans of lower primates.<ref>Cold CJ, [[Ken McGrath|McGrath KA]]. [http://www.cirp.org/library/anatomy/cold-mcgrat/ Anatomy and histology of the penile and clitoral prepuce in primates: an evolutionary perspective of the specializes sensory tissue of the external genitalia]. In: Denniston GC, Hodges MF, Milos FM (eds). ''Male and female circumcision: Medical, Legal, and Ethical Considerations in Pediatric Practice''. New York: Kluwer Academic/Plenum Publishers, 1999. pp. 19-29</ref>
In other words, in monkeys and apes, the [[glans]] is more sensitive then the foreskin. In humans, this is reversed, so that the [[foreskin ]] is more sensitive then the glans. ]An impressive study performed by objective Chinese researchers conclusively demonstrated that [[adult circumcision| circumcision]] reduces the [[glans]] sensitivity to vibration. "The test group were 1.97 +/- 0.71, 2.64 +/- 1.38, 3.09 +/-1.46 and 2.97 +/- 1.20 respectively before and 1, 2 and 3 months after circumcision, with significant difference between pre- and post-operation (P < 0.05).<ref name="young2008">{{REFjournal
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