Recently at Judo I have not worn a cup, though this week a new guy had a serious spaz attack, during which he had a sort of leg spasm into my my nuts and another time he slapped my face whilst flailing about on the ground, and I was not even doing much to him.

Still it was not too bad, but would have appreciated both a mouth guard and a cup in those moments, but 99% of the time have not needed either so not wearing a cup now, but if the class was full of guys like that then I would wear it every time.