It's the functional equivalent of an R rated movie. Expect it to get as explicit as Ori ~ Ochi ~ Onoe - but no more than that. If that.
CategoryAmericanism unpacking: "Restricted" under the American system: minors require an adult with an ID card to see R-rated movies.
Heavily based on the Final Act introductory scenario from the first edition, Ignition Stage - which, while it's out of print, has a LOT of versions of it posted online, including one in the main BlissStage article.
Posting my random snippets of script and other BrainDump?s at [Scratchpad] - if anyone would be interested in poking about.