sentences:  A Master & slave "relationship" is normally a long-term relationship, comparable in duration to normal relationships whereas a Dominant - submissive "relationship" could be of a similar duration or shorter from a few minutes, as in a scene.Depending on their contract, a sex slave may be traded by the master, facilitated by sex club events, personals in BDSM interest magazines or internet based social networks.Commonly, a slave is also said to be a collared slave, though not every slave wears a physical slave collar.