Why does this happen?
It's not your testicle that's "breathing" but rather your scrotum. The scrotum skin contains many tiny muscles that control the looseness or tightness of the skin in relation to temperature. In cooler temperatures these muscles contract to tighten the skin and bring the testicles closer to the body; in warmer temperatures, they relax, letting the testicles hang farther from the body. Under certain conditions the scrotum can seem to have a life of its own, as these muscles oscillate back and forth between contracting and relaxing. That's what you're noticing. It's totally normal.
Do you find yourself masturbating more often during some seasons than others? Why?
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