Cup and mouthguard + 1.
I like wearing a cup, for the protection and it keeps everything in place and out of the way (maybe that's just me). I've had to pass up on armbars before when my junk got between the arm and pelvis. Also I have been kneed accidentally before by overly zealous new guys, glad I was wearing one. One time I had my teeth ground together by getting caught in a guillotine while breathing out of my mouth, chipped my teeth a little, I've always worn one since then. I'm a bit surprised their aren't more stories like this, maybe I'm just really awkward or unlucky

lol