I'm uncut and to stretch I retract the foreskin and grab behind the glans. I think that this "squishes" the glans creating wrinkles and there are now ridges on the corona. It doesn't hurt but I was wondering how uncut guys manage to stretch because if I try gripping an inch or so behind the glans, the foreskin just rolls over the head. It's not really a matter of force of grip, that's just how it is. Do you guys have any tips?