The consensual: BDSM in the "submissive" agrees to be such; Furthermore, the limits and the rules of the relationship are defined on the basis of an agreement equally accepted by both parties in a conscious and consensual. Even in the case of a TPE relationship, in which the dominant has complete control over the subject, there is the possibility for the submissive, to withdraw their consent at any time. In the absence of these requirements in any SM practice is to be considered a serious abuse and is illegal. 

The use of "safe word" (security word) that gives the possibility to the passive partner to stop the game at any time. In some cases the safe word is replaced by an agreed gesture (eg .: raise or open the hand), BDSM necessary in those games in which the subject (slave) is physically prevented in the word. Establish in advance a word or a precise and unambiguous signal is necessary, because express asimple denial (no, no!) Might seem an expression of entreaty linked to the role of victim and not be interpreted as a rejection of reality. In any case, the one who dominates the responsibility, including legal, to monitor the physical condition of the subject are the best possible and avoid the onset of potential permanent damage.,