I remember when they were in the same building as an underground Lapdance place which used to advertise here and every once in a while someone would get off on the wrong floor and be slightly confused.
You've probably heard of BDSM which puts us in the general area of paraphilias. B&D (bondage and discipline) D/s (domination/submission) and S/M (Sadism/Masochism) are a large part of this. Power exchange underlies all of this. One party submits to the control of the other. This can be manifested explicitly through rituals and costumes or it can be present in the style of a relationship, sexual or otherwise. Hope this helps.