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BDSM is an umbrella term for certain kinds of erotic behavior between consenting adults. There are distinct subcultures under this umbrella term. Terminology for roles varies widely among the subcultures. Top and dominant are widely used for those partner(s) in the relationship or activity who are, respectively, the physically active or controlling participants. Bottom and submissive are widely used for those partner(s) in the relationship or activity who are, respectively, the physically receptive or controlled participants. The interaction between tops and bottoms—where physical or mental control of the bottom is surrendered to the top—is sometimes known as "power exchange", whether in the context of an encounter or a relationship.
In BDSM, Master/sub slave, M/s or sexual sub slave slavery is a relationship in which one individual serves another in an 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/sub slave structures
The term "BDSM" is first recorded in a Usenet posting from 1991, and is interpreted as a combination of the abbreviations B/D (Bondage and Discipline), D/s (Dominance and submission), and S/M (Sadism and Masochism). BDSM is now used as a catch-all phrase covering a wide range of activities, forms of interpersonal relationships, and distinct subcultures. BDSM communities generally welcome anyone with a non-normative streak who identifies with the community; this may include cross-dressers, body modification enthusiasts, animal roleplayers, rubber fetishists, and others.