My penis is not erecting when I think about sex or when I attract on anyone, but when I masturbate it is erecting. Is it a problem of my neurons or any other? Before this situation, always smegma occur on my penis but now no smegma occurring in my penis. Is it a problem of penile sensation or penile tissue? I have one problem too, when I wakeup from a sitting place my head balance get lose and I will get rotated. Is it a problem of neurons. Does this cause my penis? Please give me a good prescription? Is himcolin gel good for penile sensation, can dopamine or serotonin used for penile sensation.