Why does it do this, and is it normal and healthy?
It's entirely normal and healthy. Your scrotum changes size and texture with the temperature – it's a mechanism your body uses to keep your testes a few degrees below core body temperature, since sperm cells require a slightly lower temperature to develop normally. When your body (and/or your scrotum) is a little cold, tiny muscles in your scrotum contract; this causes the skin to bunch together, making the scrotum appear smaller and making its texture more firm to the touch. At the same time your testicles are drawn closer to the body so they can stay warm. When your body is warmer, the muscles relax, causing the skin to loosen and soften and letting the testicles hang lower where they can stay cool.
Do you find yourself masturbating more often during some seasons than others? Why?
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