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→Dartos muscle
Secondly, 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.
== Why two layers? ==