At this very moment, I wish there was a door system you could set up on every door (inside of door/outside of door), and when a Sim entered the room to the inside of door part, the door would automatically be locked until he/she exits. Because now, it feels like everytime one of my Sims takes a shower, bath or uses the toilet, another will sim will decide that they must reach the bathroom basin immediatly. I have to manually lock the door everytime to ensure they're left alone and if not, be on high alert outside the door.
