yes, he needs to immedietly stop this..the best thing to do it let it have a natural flow...
1. it could stay in there, but slowly come out after a while, which can be quite embarressing.\
2. it could go back into his bladder which is EXTREAMLY dangerous.. this is a part of why the blatter is temporarly blocked off by a valve after ejaculation... so it all needs to come out..
3.. the "ejaculation" nerves could eventually get damaged.. which means they could get weaker. and THAT mean sooner or later he wont have anything to pinch
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