The Dartos muscle reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Dartos muscle

The dartos muscle is a muscle inside the scrotum (the only one). It acts to regulate the temperature of the testicles in order to promote spermatogenesis. It does so by expanding or contracting the scrotum. Contraction reduces the surface area of the scrotum, thus reducing heat loss and thus warming the testicles. Conversely, expansion increases the surface area, promoting heat loss and thus cooling the testicles.

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