Hello, I'm a 15 year old uncut male. Currently, after I masturbate, sometimes I use a stream of water from the shower and let it hit my penis while still in the foreskin, after a little while this almost forces me to urinate and therefore cleans my urethra. I was wondering, though, if this could lead to less sensitivity? I've only done is 10 or so times, and was concerned so I stopped, but I'd like to know if you think this is possible. How easy is it to damage the penis' sensitivity? Also, does masturbation make you less sensitive, and if it does, after you stop masturbating does the sensitivity return?