I quit wearing cups after a 7th grade football game when I took a helmet shot at full speed. The wedge part split my balls and the sides of the cup smashed the boys up into my thighs. not only was that the worst pain i've ever felt, but i had a bruise in the outline of the shape of the cup all the way around my crotch for the next week. i've been hit in the balls in Judo many, many times since then. Uchi Matas, Tomoes that slip, people trying to pass guard, all sorts of good stuff. It's still never hurt as bad as that moment in time. Now, my sport doesn't allow anything hard - plastic or ****l - to be worn while we play, so it's not a concern anyway. Over in the armbar forum, there are some dudes arguing that a good grappler would almost always wear one. I think that relying on a cup to finish an armbar discourages good technique, and is completely unnecessary. None of the guys I know that do Judo or BJJ or Wrestling wear cups. Ever. Discuss.