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The cremaster muscles are in the spermatic cords. When you get cold, these muscles pull the testes into the body. Also, there are tiny muscles in the scrotum itself, and when it gets cold, they draw up and give the scrotum a thick, shrunken, leathery appearance. So together, both sets of muscles make make it look like you have no testes at all.

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10y ago
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Q: How do do muscles in the scrotum affect the appearance of the testes?
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