Risk-aware consensual kink (RACK, also risk-accepted consensual kink) is an acronym used by some of the BDSM community[1][2] to describe a philosophical view that is generally permissive of certain risky sexual behaviors, as long as the participants are fully aware of the risks.
According to David Stein, the man who coined "Safe, Sane, and Consensual S/M" for New York's Gay Male S/M Activists organization, SSC was only intended to be put forward as a minimum standard for ethically defensible S/M play, to establish a distinction between play between loving S/M partners and the public perception of sadomasochism which would be more accurately described as abusive behavior.
"Instead of asking people to think about what it means to do S/M ethically, and to make the hard choices that are sometimes necessary (if only between what's right and what's right now), many organizations today act as if these issues have all been settled, assuring us that sadistic or masochistic behavior not deemed SSC isn't S/M at all but something else — abuse, usually, or domestic violence or poor self-esteem.
"[8] In 1999, Gary Switch posted to The Eulenspiegel Society's USENET list "TES-Friends" proposing the term RACK out of a desire to form a more accurate portrayal of the type of play that many engage in.
Noting that nothing is truly 100% safe, not even crossing the street, Switch compared BDSM to the sport of mountain climbing.