Cock-and-ball torture (CBT) refers to the BDSM practice of inflicting/causing pain or discomfort to the penis and testicles. Dominants will make use of this activity with their submissives/slaves, mostly by a Dominatrix. The scrotum and penis are full of nerve endings, making them extremely sensitive. For some people the very thought of CBT makes them cringe, whilst for others, particularly masochists, the idea of being hurt in their 'nether' regions is highly erotic and very pleasurable.