Cock and ball torture is when someone causes pain or discomfort to someone's private parts (their genitals). This can be done with hands, special tools, or even whips and chains. It can be done for sexual pleasure, or to make someone feel uncomfortable. Sometimes people do it because they like the feeling from the pain, and sometimes people do it as part of a punishment. In any case, it should not be done without asking permission first, and the people involved should take extra care to make sure it is done safely and does not hurt too much.