Master (Mistress)/Slave

Master/slave, M/s or sexual slavery is a relationship in which one individual serves another in a consensual authority-exchange structured relationship. Unlike dominant/submissive structures found in BDSM in which love is often the core value, service and obedience are often the core values in Master/slave structures. The participants may be of any gender or sexual orientation. The relationship uses the term "slave" because of the association of the term with ownership rights of a master to their slave's body, as property or chattel. 

Sexual slavery in a BDSM context is both a sexual fantasy and sexual roleplay. The slave master or mistress might be any person or group, though the majority of such relationships are usually either one dominant, or a committed dominant couple, owning one or more slaves. A slave and the owner, and others involved in the relationship, can be of any gender, sexual identity, or orientation.