Penis Vibrates Fine?
It is normal for the penis to vibrate after urinating. Most are caused by contraction of the muscles of the urinary tract to expel the residual urine that is still left behind. If the complaint goes away on its own and there are no other accompanying complaints then there is nothing to worry about. If you still feel anxious, you can consult directly with a urologist.
The penis is an organ rich in blood vessels and innervation. Therefore this part becomes more sensitive to stimuli. Sometimes this penis can feel a vibrating sensation. This is believed to be due to stimulation of the innervation around the penis. This stimulation becomes excessive in some conditions such as riding a bicycle, sitting too long, watching porn, or masturbating.
May be useful
dr. Muhammad Fadhil