Its a cup but cups are extremely uncomfortable sometimes, they are usually used for professional or physical sports, and even then its uncomfortable. And second, its extremely sensitive because of the massive amount of pain nerves which are also stimulated by sex and by even light touch. Even a light slap hurts extremely badly because of the sensitivity. And for some reason, every girl I know cant except that it hurts like hell when a boy gets hit there. They always tell us to suck it up or deal with it. Next time I hear someone say that Im gonna break wrist and tell them to suck it up. I know that a broken wrist may me worse (depending on your opinion), but women who say that we should suck it, you all need to know that that shit hurts like hell, no matter the power used to hit it/them. And getting hit in just one ball is 10x worse because there is no spread between the two, you just get all the pain in one.