"In response to heat or total relaxation, the scrotum becomes very loose and soft, with a smooth surface, and the relaxed muscle fibers cause the testicles to hang farther from the body. These changes in the scrotum illustrate the primary function of the scrotum, which is to act as a natural climate control center for the testicles.

The temperature in the scrotum is a degree or two lower than the usual body temperature of 98.6 degrees Fahrenheit. The testicles need this lower temperature in order to carry out their job of producing viable sperm.

If the testicles are kept at body temperature or higher for a prolonged period, infertility or sterility can result. The scrotum continually monitors the environment for temperature changes and responds automatically in the way that is best for the production of healthy sperm."
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