The nerve supply to the penis & scrotum is via the pudendal nerve, which gives off the dorsal clitoral or penile nerve, and also gives off the perineal nerve, which in turn gives off posterior scrotal nerves.If pudendal nerve or branch of it is damaged then you may get numbness or loss of sensation over penis and scrotal area.Get examine yourself by a physician.
Oh, you are one of the few others getting a symptom like mine. I guess that my numbness has developed as a complication of my reccurent/stuttering priapism. No sure reason why the priapism started in me in my first few teen years, but it did and I never got medical treatment for it back then so probably got some serious long term damage that left me suffering even now in my 30's. Did you ever hear about priapism yet? A straddle injury can lead to perineal nerve damage and or priapism. Hope you the best, hope I have helped or encouraged you.