The Bottom Knuckle Rubber
I have resently discovered the real masterbation feeling. I find when I hold my hard dick tightly but not to tight and make a fist with my right hand(dick is being held in left hand) and rub the bottom of flat part below the knuckles it gives me a great feeling after a while. I find the movement of the skin and my hand due to the use of no lube enhances the feeling. Try it!