I'll answer my own question. This isn't a simulator, but a collection of minigames united by a mundane microplot that completely ignores the surrounding environment. The brothel is there only to explain why girls don't need much persuasion. Basically, the scene could have been anywhere: an office, a cafe, a hotel. It makes no difference. The reward for completing some minigames is porn scenes. While the models are pretty ugly, the animations are good.So how does it work? A brothel and a harem in one game? Does the entire brothel run on the main character's sperm or does the developer put all his efforts into not confronting the player with the reality of the girls working in the brothel, so as not to destroy this illusory world?