Comment by ghaff

Not sure how uncommon that is. Certainly a sink is often in an open alcove. The toilet and probably often the shower is in a subroom with a door.

Not sure how common sharing a room with a work colleague--especially of the opposite sex--or a family member who is a teen is. But traveling with friends, activity partners (hiking, etc.), so much of what's being discussed on this thread just isn't a real issue in my experience at least in most Western culture.