I am having numbness and lost sensitivity in perinnium and penis. I can feel the touch, but it is not as sensitive as before. My penis has also shrunk very much. It happened right after a hard masterbation, I pulled my penis hardly during it. I am no longer able to move the penis without touching (flex it). It is also difficult to force during poop as perinium is numb. I used to feel numb after masterbation, also had tingling feeling for some time, but now the numbness did not go away and also there is no tingling feeling. I also used to sit on chair a lot as a part of my work.