Why does it do that?
There's an amazing network of tiny muscles under the scrotum skin. In colder environments, these muscles contract, pulling the skin into countless tiny folds. Not only does this effectively thicken the skin, it also draws the testicles closer to the body. This response occurs because sperm cells require a temperature a few degrees cooler than body-core temperature to properly mature. By hanging away from the body the scrotum achieves this slightly cooler temperature – but if it gets too cold, the testicles huddle closer to the body for warmth and the skin thickens up. Incredible, isn't it?
Do you find yourself masturbating more often during some seasons than others? Why?
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