I know you talked about putting in a bath/hotsprings area. If I could put my two cents into the game, I personally think a good compromise would be that once you get at lease 2 members into your harem then it could become unlocked. It could be a player unlock or unlocked by the host once the unlock requirements are met. but that is my two cents
Feel free to use it or borrow elements or just not pay attention to this comment. its your project and I can't program my way out of a wet paper bag.