BDSM: a form of sex play or role-play which combines Bondage and Discipline (BD), Dominance and Submission (DS) and Sadomasochism (SM). A catch-all term for a broad array of sexual practices, especially involving restraint and inflicting pain. Mostly disapproved by escorts, or escorts choose for a form of soft active. Definition of Unicorn: A Single Female To Swingers. Swingers Club,Sex Party Terminology at OurPlace4Fun and Swinging Terms and Acronyms for Newbies Voyeurs, swinging couples,single ladies, single males.