Sadomasochism need not be rendered completely free of risk. It is sufficient that each participant is aware of the hazards and consents to them. Moreover, no government can legislate for the most reckless of its citizens. If an individual is so disturbed as to place a plastic bag over his head for the purpose of sexual stimulation, the contrary opinion of the law will not be a great deterrent. [i]  Nevertheless, Sadomasochism can be rendered relatively free of physical risk for its participants. ‘Safe words’ can be agreed in advance, and then announced to end an S&amp;M session immediately. Where participants are restrained or prevented from speaking, movement signals or the dropping of a marble held in the hand can be used to indicate withdrawal of consent. This simple device ensures that participants continue to agree to the terms on which their encounters take place.  It is patronizing to assume that participants in S&amp;M scenarios have not considered the possibility that expressions of pain and reluctance will be a regular occurrence during such activity. Deliberately quixotic ‘safe words’ and stop signals are used in order to avoid inadvertent abuses of consent.  [i] Annette Houlihan, ‘When “No” means “Yes” and “Yes” means Harm: Gender, Sexuality and Sadomasochism Criminality’ (2011) 20 Tulane Journal of Law &amp; Sexuality: A Review of Lesbian, Gay, Bisexual, and Transgender Legal Issues 31