Bondage is one of the main themes of BDSM— which stands for Bondage and Discipline, Dominance and Submission, Sadism and Masochism. It is a sexual practice that involves the tying up or restraining of one partner. Bondage is a form of sex play that focuses on restraint. Having another person control your pleasure is central here, and it can involve props such as handcuffs, ropes, blindfolds, or a range of restraints.