It depends on what kind of sex you have got. You can allways hurt your muscles if you do something, and if you dont have any regularly training its even more dangerous to get soure muscles or something like that.
But let me tell you something that definitivly prevents some hurt… If you cook something with pepperoni, use gloves while cooking and working with them. Or wash your hands ten times before having any kind of sex. And yes that happend to me and my seconds boyfriend while we both were cooking first time with pepperoni. He had that pepperoni oil still on his hands while he put some lube on my cock and he sit down on it realy fast... after 30 seconds i said "stop something is wrong" and a few seconds later he also felt it... took us some hours to get rid of the burning hahaha
