I never mentioned anything about consent or trust. Bdsm is very broad because it encompasses a wide range of kinks and fetishes. Many people get off on either them or their partners being uncomfortable while others need a pre agreed role to play and limits while others want a no limits relationship. B=Bondage, D=Domination S= Sadism and M= Masochism. If you're a masochist you may get off on just some slight discomfort or pain while others such as let's say rebel rhyder a hardcore pornstar enjoy extreme fetishes.