This is easily distinguished from kidney problems, because it only happens in public bathrooms, usually when others are around. You walk up to the urinal, unzip, pull it out, and wait. You try flexing every muscle down there, but the one that you were born knowing how to use just won't budge. I am sure that this happens to everyone occasionally. I thought I had conquered this problem and could whiz anywhere at any time until I tried to whiz at a truck stop. Another gentleman walked in behind me, stood at the urinal right next to me and proeeded to stare at my package. That will do it to ANYBODY.