I wasn't being entirely serious there if it wasn't obvious. But that aside
Every person in the world who has ever watched porn?
Come now. You know what I mean
hmm. Or maybe you don't.
The vast majority of porn isn't about some exploration of two other peoples non sexual relationship status.
e.g; does this read like porn people watch?
"oh man the nameless NPC's are about to start fucking!" But obviously without fucking. Would make for a poor porno.
The point is to show some small events that maids and guards are fucking. There's another one that shows/implies maid and maids are fucking. None of it for sexual gratification unless you (hypothetical you, not you as in you) get your rocks off to the mere knowledge that two faceless nameless characters are fucking each other.