Ball licking refers to the slave using her tongue to lick and stimulate the Master's scrotum. In addition to his penis, a man's scrotum is very sensitive to both pleasure and pain. Because of this sensitivity, many Masters enjoy having their slave start or prolong oral sex by licking the Master's balls.

Masters are expected to be clean and wash well before engaging in activities with their slaves, which means that this activity can be highly desired by the Master, while not being unpleasant for the slave.