XHTTPX//en.wikipedia.org/wiki/Bottom_(BDSM) BDSM is an erotic preference and a form of sexual expression involving the consensual use of restraint, intense sensory stimulation, and fantasy power /wiki/Sexual_roleplaying. The compound /wiki/Acronym_and_initialism BDSM is derived from the terms /wiki/Bondage_(BDSM) and /wiki/Discipline_(BDSM) (B&D or B/D), /wiki/Dominance_and_submission (D&S or D/s), and /wiki/Sadomasochism (S&M or S/M). BDSM includes a wide spectrum of activities, forms of /wiki/Interpersonal_relationship, and distinct /wiki/Subculture. Activities and relationships within a BDSM context are characterized by the participants usually taking on complementary, but unequal roles, thus the idea of consent of both the partners becomes essential. Typically participants who are active – applying the activity or exercising control over others – are known as /wiki/Top_(BDSM). Those participants who are recipients of the activities, or who are controlled by their partners are typically known as /wiki/Bottom_(BDSM). Individuals who alternate between top/dominant and bottom/submissive roles — whether from relationship to relationship or within a given relationship — are known as /wiki/Switch_(BDSM).#cite_note-Terms-0