Rough
Rough is a quality, not an arrangement. It means sex written with force in it: grabbed, pushed against a wall, held down, hair in a fist, the register of two people who want each other more than they want to be careful. Readers who tick it are not necessarily asking for a power exchange or for anything with a name; they are asking for intensity, and for a scene where politeness has stopped being the point.
The distinction from BDSM matters. Rough has no protocol and needs no negotiation on the page; it is a mood the scene is in. What it does need, and what bad fiction drops, is that both people are still there. Rough between two adults who are both in it reads as heat. Rough written as one person doing things to an absent body reads as something else, and the engine is built for the first.
How the engine handles it. With Rough ticked, the plan gives the physical scenes their edge and the engine writes force with physical clarity: where each person is, what is holding what, weight, breath, the loop of action, sensation and response. Consent stays legible in behaviour rather than announced as a formula; the characters read each other and answer what they read. Rough combines well with dominance or strangers, and it is the theme most dark romance readers tick alongside their genre. The explicitness level decides how much of it is on the page; the theme decides how it feels when it is.
Your stories are encrypted at rest. We can read them to write them. Nobody else can read them.