Had mine done about 12 years ago. I split the skin whilst giving an ex GF a good seeing to on the utility room bench! Didn't even notice til next morning.
The skin just wouldn't retract over the helmet when I got a hard on. Doc advised a jewish trim. In and out in a couple of hours. Advised no hanky panky for a fortnight, not even manual hanky panky.
Doc advised to not go to bed on the night of the op as the 'bits' where numb and the numbness would wear off. I sat watching TV about 2am and thought I could feel dribbling down my leg. I chucked the blanket off and there was a big pool of dark red blood that had oozed out of a bust stitch on my knob. Back the next day for a restitch.