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Q: I've been told my by girlfriend that my scrotum is far and away the stretchiest she's ever seen. It seems normal to me. I can stretch it out from roughly the size of a golfball to what would be enough to fit baseball inside of it. Is it really that unusual for that body part to be that elastic?

It's not that unusual at all. Really, you sound pretty normal. I've seen one man with a scrotum even stretchier than that, and a few that were not nearly as much so, but in any case I've seen it really is pretty amazing how far that skin can stretch.

Since the testicles can not produce sperm properly at human body temperature, the scrotum evolved to keep the testes away from the main body cavity where they can stay cooler. That is why your scrotum seems to get even stretchier in warm weather, and contracts when temperatures get cold … and as every guy knows, the "stretch factor" can vary widely for each individual man, depending not only on the ambient temperature, but also his current level of sexual arousal.

But all that aside, when everything is relaxed, the scrotum is probably the most remarkably elastic areas of skin on the human body.