There is no "one rule" and certainly not SSC. Go read up, here and elsewhere, on the many many discussions on SSC v. RACK. And WIITWD as a backlash to both the former. And speaking of made-up stuff (per my previous comment regarding acronyms,) there is now PRICK. Originally a joke that has been taken up as a legitimate approach to BDSM play, (though how it differs from RACK is all in the semantics imo.)
SSC and RACK and WIITWD were originally all affectations that we use to explain ourselves to the vanilla community, though to no avail, because there's no rationality when it comes to detering the sexually repressed or "morally superior" population.