To cum more than two tablespoons and to miss the projected target making the surrounding objects messy.
girl: hit me from behind
*bang* *bang* *elevation*
boy: should I cum inside you or on you?
girl: you decide
*ejaculate*
girl: did you just miss, hit the sheets and then my sock?
boy: ummmm
girl: look at your messy cum, do you have self-control??
boy: I got too excited and couldn’t decide, then I ran out of time deciding