I have been having a sensitivity problem. I am 17 years old and my penis has lost all sensitivity save for the head. My orgasms feel like nothing and the shaft has no sensitivity however I can ejaculate easily. I believe that this is due to over-masturbation and my nerve endings are damaged. I have masturbated for 5 years now and only used a cream for 1 year. Yes, I have stopped masturbating for several months with no results. Furthermore, it is much harder for my penis to become erect it takes a lot more stimulation and the erection goes away fast when the stimulation stops. My penis is also not as hard as it used to be. I suspect that the blood flow is slowed due to over masturbation. I used to be able to get it up with just masturbation but that is not possible now. I do not even get morning wood anymore.