I am going to show you exactly what I think you should do with your cock! First, you need a hammer and two nails of different thickness. And really, some antiseptic would be great to have on hand.

Now, this can be done with your dick hard or soft. I prefer hard, because of the added sensation. Use a wooden block on the underside of your cock to catch the nail after it goes through your shaft. Let's start with the smaller nail and position it near the base of the penis. I must warn you at this point, this is going to hurt you a lot more than it will hurt me!