Yes, my left ball is bigger than my right ball and it also hangs lower under normal non-horny conditions. Lol
Where I can really tell, and why I have no clue, but its when I put on one of my metal cock rings. I have multiple sizes, depending on how tight I want the feel, and when I use the smaller rings I have not insert my right ball first, then squeeze my left ball in after it. Somehow the right ball is taking up less room in my sack and it allows the left ball to slip in and through the cock ring. If I insert my left ball first, I can never get my right ball inserted. Strange, but true and maybe TMI, but I thought I'd share.