I have pain if my wife is on top and leaning back and I am super rock hard. this also seems to stimulate her immensely and she usually cums, so I just relax a little and then my cock doesn't hurt. I have had an overall soreness in my cock from too much sex the night before, this was when I was younger, and the some of the gals I dated, really needed and liked a lot of fucking in a short period of time.