Sex is happening out of sight or behind something, so the comic leans on silhouettes, blocked angles, and sneaky glimpses of skin while the fucking stays mostly obscured. A lot of scenes play up secrecy with characters hiding behind doors, under desks, or in crowded rooms while someone else is nearby, usually with moans and motion cues doing the heavy lifting. It often overlaps with clandestine public sex vibes where getting caught is part of the turn-on.