Sorry but those are INCREDIBLY PAINFUL.
Not only do they clamp your urethra shut, but they clamp off the blood supply to the tip of your penis too. I got one because I can't consciously hold my pee any more, and thought it would work great for when I need to give a urine sample. Clamp it off for 30 minutes and I'd have enough backed up to give a sample, yea right. Except you can't use it for more than 5 minutes before turning purple with all that associated pain.
And yes I did start off trying to clamp it off very lightly, but move stand or walk even a little and you'll leak out all over the place and defeat the point of using it in the first place. It unfortunately has to be tight enough to stop the fluids from flowing, which means urine just as much as blood. Given this, I highly recommend AGAINST using a clamp.
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