It is really weird how many of the popular nsfw games on itch have dark world building. And like, none of the themes are sexualized in any major way
Like, my dystopian robot girlfriend feels more like a critique of America/capitalism than it is a porn game. Main story of Lust Doll is -literally- centered around consequences of slavery and other social/moral issues(75%). Three major characters in BDCC and the main storyline is also based on consequences of slavery and even colonialism. Scarlet law literally starts off with an option to kys as the protagonist tries to save his family from collapse because of slavery. Free cities shove the darkness that loomes over the world to your face in every step of the way. And there are also countless post apocalypse games that are at least as much as if not more gloomy than the games listed above
Like even in some games that are not centered around such themes, the writers casually drop some observation of the human state. For example, in queens brothel there is literally a commentary on nuclear weapons and that short little side story ends in a dark way too
You all gotta calm down bruh I just came to jack off 💀