BDSM stands for three different sets of erotic practices: bondage and discipline, domination and submission, and sadism and masochism. Books in the BDSM genre take readers into realms where role playing and restraint go beyond the usual acceptable norms of sexual expression. Here, partners may use whips, gags, masks, pain, and/or humiliation to achieve domination and fulfill their fantasies. Stories in BDSM genre follow characters as they learn about these inclinations and explore them further, plunging them into unknown worlds and discovering new possibilities.