BDSM activities, for a fixed period of time rather than mostly in the form of an erotic role-playing game and a single game is called BDSM session. Many of the practices as exercised within Schmerzzufügung BDSM, humiliation or submission would be considered without the context of specific sexual preference as unpleasant. Sexual intercourse such as oral, vaginal or anal intercourse may also occur within a session, but is not essential.