Subway is for adult scenes built around train cars, station-like movement, and the pressure of shared transit space. The appeal is not just the location, but the tight distance, quick reactions, and staged commuter atmosphere that make the scene feel different from a generic public setting.
The Subway category works best when the setting changes the mood of the scene. A narrow carriage, station-like pacing, standing-room tension, or a commute-inspired setup can make the fantasy feel more specific than a normal outdoor or public-place clip. It should be treated as staged adult content, not as encouragement of real-life public misconduct.
The strongest signals are carriage interiors, platform-like movement, crowded-space framing, and the sense that the characters are in transit. When the camera uses the limited space well, the scene feels closer, more tense, and more recognizably Subway than a broad Public category entry.
Public is a broad place-based category, while Elevator is built around a small enclosed room. Subway sits between them: it has public-space tension, but the transit setting gives it its own rhythm, movement, and commuter fantasy.
Use Subway when the train or station atmosphere is part of the reason to click. If the scene is simply outdoors, Public is usually a better fit; if the appeal is a tight vertical room, Elevator is more accurate.