Ballbusting is a type of BDSM that involves domination and submission. It typically involves a dominant partner inflicting pain or humiliation on the submissive partner's testicles in order to gain control over them. This type of play can include spanking, stretching, squeezing, and flogging the testicles. Ballbusting can also involve verbal humiliation and physical restraint. It's important for both parties to discuss their boundaries beforehand to ensure the safety and comfort of all involved. Ballbusting can be extremely pleasurable for those who enjoy it, but it should always be done with caution and respect for one another.