The three kink-ethics slogans — SSC (safe, sane, consensual), then RACK (risk-aware consensual kink), then PRICK (personal responsibility, informed consensual kink) — each one rewriting the last to be more honest about risk.
SSC came first, in 1983, when a New York activist group needed a short phrase that told the outside world kink was not abuse. It worked almost too well: "safe, sane, consensual" ended up on flags, T-shirts and tote bags, and somewhere in that merch the word "safe" got read as "risk-free." Which is a problem, because nobody who has ever tied a rope or held a flogger believes any of this is risk-free.
So in 1999 came RACK. The pitch, from Gary Switch, was blunt: nothing is fully safe, so stop pretending. His line was that even "crossing the street" carries risk — you don't avoid it, you learn to read it, the way a climber trains before touching a mountain. RACK swaps the binary of safe/unsafe for a dial: safer, less safe, and you decide where on it you want to play. That makes room for edge play that SSC would rather not look at. Later, PRICK added one more accent — personal responsibility — the reminder that a scene is a choice you own, informed and out loud, not something that just happens to you.
Here is the part people miss: these are not three rival gangs you have to pick a side in. It is one idea getting more honest with every rewrite. The through-line never changes — informed people agreeing to what happens to their own bodies. Pick the acronym that keeps you honest, not the one that sounds toughest at the bar.