I have a set of 3 cheap c-rings. I first thought that I must be on the really small side, because I could only use the smallest ring. I thought that I was supposed to use one, and just select the size that fits best around the shaft. One ring was about right, one was a little too big, and one was WAY too big. I've since discovered that the biggest one is supposed to fit up against my body, around everything. However, I'm still confused over the middle sized ring. I found some reviews on Amazon indicating that the middle ring is to be worn around the testicles. It's a tight fit, but I managed to get "the boys" in there, BUT... then the middle ring rubs against the large ring, and sometimes pinches some very sensitive areas. So... how are these things supposed to be worn? Only 2 at a time? Or all 3 at once?