However, some calling themselves "slave" may only be submissive within a sexual context/activity whilst others are also submissive within other or all aspects of the relationship, "sex-slave" or "slave" respectively.
Slave training is a BDSM activity usually involving a consensual power exchange between two people taking on the roles of a Master or Mistress and a slave.
The slave then wears a collar to publicly declare the slave's subjugation and the Master's ownership.
Such a collar may be a piece of neckwear, or may be a bracelet or other piece of jewelry that symbolizes slave status.
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.