BDSM is the collective term for Bondage & Discipline, Dominance & Submission, Sadism & Masochism. Practices range from light role play to bondage play, slapping practices (spanking, flogging), wax and ice play to breath control and sensory deprivation.
Basic rule: SSC (Safe, Sane, Consensual) or RACK (Risk-Aware Consensual Kink). Stop words and tip signs are mandatory. Specialized dominatrix studios in CH: Zurich, Basel, Bern, Geneva, Lugano. Prices usually 250-600 CHF/h.