• BDSM: A compounded acronym for B/d (Bondage/discipline), D/s (Domination/submission), and S/m (Sadism/masochism). It covers the three aspects of a lifestyle that usually involves more than one or all of these sets of activities, but may also only include one.
• Binding: Wrapping the feet or genitals with string, rope or lace.
• Bisexual: People who are sexually attracted to both sexes.
• Blindfolding: Covering the eyes during sexual play.
• Body Painting: Drawing or painting temporary designs on the body.
• Body Worship: Sex game in which one partner willingly chooses to adore another's body.
• Bondage: Physical or mental restriction of a partner.
• Bottom: The casual term for someone who enjoys the submissive role but is not generally committed to a full-time D/s relationship or one partner.
• Caning: A whipping with a switch or cane; an extreme form of erotic sensation play.
• Discipline: Punishment and control of a partner during sex play. Sometimes administered without erotic attachment as a training measure for submissives and slaves.
• Dominance/Submission: Power exchange between partners.
• Dominatrix/Domme/Dom: A person, usually hired, to function as a top or sadist. (Dom is the male version; domme and dominatrix are the female versions).
• Dungeons: Rooms that are decorated for SM play.
• Erotica: Sexual literature and photos.
• Fantasy Play: Acting out sexual fantasies.
• Fantasy: A mental image or illusion, sometimes sexual.
• Fellatio: Oral sex performed on a man.
• Fetish: An object that replaces people as primary object of love.
• Fisting: Inserting a fist or hand into the vagina or anus.
• Flagellation: Striking a person with an object.
• Frottage: Rubbing one's body against a partner or object for arousal.
• Harness: Body harnesses used in suspension or penis restriction, or straps worn to support a dildo for penetrating another partner.
• Whipping: Striking or flagellating a partner for sensory enhancement.
• Slave: Someone who has agreed to give up all personal rights to their dominant or master. This may or may not ever include sexual contact.      
• Sex Slave: A slave whose designation is specifically for sexual purposes. It is not simply someone who enjoys being dominated. Many who enjoy being dominated and are not sex slaves.