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# Penile skin undergoes a marked frictional change, brought about by stiff, forward-pointing [[skin]] folds. The mechanism is similar to that which raises goosebumps.
The changes in penile skin are brought about by contraction of the [[Dartos]] muscle. Between them, stiffening and frictionality ensure that the [[ridged band ]] is instantly alerted to changes in position of the [[penis]] within the [[vagina]].
[[Category:Physiology]]