I'm telling you, these are actually *very* interesting.
1. There's a strict "no groin grabbing" rule in water polo. So, like, grab someone's ~thingy~ and you're outta there.
Competitors also can't splash each other in the face. I do feel like there might be some accidental groin-grabbing and splashing what with all the frantic movement in this sport, but hey, what do I know?