9 Ball-Busting Things You Should Know About Testicles – MysteryVibe - Testicals tighten before sex
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The skin is loose and mobile, allowing his penis to grow. His scrotum – the bag of skin holding the testicles – becomes tighter, so his testicles are drawn up. It's worth noting that getting the balls involved during sex can be a wonderful thing, and even the swinging and bumping sometimes involved in.