The fundamental principles for the exercise of BDSM require that it be performed with the informed consent of all parties. Since the 1980s, many practitioners and organizations have adopted the motto (originally from the statement of purpose of GMSMA—a gay SM activist organization) "safe, sane and consensual", commonly abbreviated "SSC", which means that everything is based on safe activities, that all participants are of sufficiently sound mind to consent, and that all participants do consent. It is mutual consent that makes a clear legal and ethical distinction between BDSM and such crimes as sexual assault and domestic violence.