Im 16 years old and i frequently masterbate. Usually after masterbating I go to the bathroom to urinate. I've always urinated with an erection after masterbating and it's not a full on erection but at least more than half way. I've always noticed that at the end of my urination with an erection, everytime I would "stop" the urine and stop pushing, I notice that my penis kind of does this little rumbling feeling inside or this strange "sucking" feeling and it feels like my penis kind of vibrates when I stop pushing at the end of my urinations. But that only happens with erections, never when im not errect. This has always happened but just out of curiousity, I wondered what this might be and if it could possibly be harmful or not and so forth. I don't mean to assume anything is wrong but just wondering if this is normal. Thanks for your help.
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