that's the glorious part of having sex. you don't give a fuck, you just go at it lol. one time i had cramps in my left foot, normally i would've jumped around and screamed, but that time it was like "I DON'T CURRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR"
This is true! You do tend to ignore pain better while sex is going on. Though I think the looming threat of falling over would take a bit more precedence than a cramp, in the case of that last question.