###Human: Why is there a penile movement when I concentrate on my penis? ###Assistant: Hello. I can understand your concern. Lack of masturbation and lack of sex results in a spontaneous flow of semen via urine. This occurs in order to allow new sperm to form. This is a normal phenomenon and this does not cause any effects on health. This will not result in weakness of any kind. The secretion which you have during talking or excitation is nothing but precum. This is a lubricating fluid and this too is a normal thing.