I don't think it's so much that you are stretching the testicles (the most likely translation for balls) but rather the scrotum and making them hang lower. I certainly like them played with and have tried improvising with cock rings. Both my improvisations and commercial rings typically integrate something like this. From my limited experience I enjoy the sensation of gentle tugging and squeezing of the skin above the testicles. However I don. Like my testicles or epidydimis pinched.
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