The scrotum is the sack of skin in which the testicles sit.

The scrotum changes shape and texture depending on temperature and state of arousal. When it’s hot and the guy isn’t turned on it’ll be loose and hang low, but when it’s cold or a guy is aroused it contracts quite a bit and gets all wrinkly. It also helps keep the testicles at the right temperature for them to make sperm.

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