Is the ubiquity of "master bathrooms" peculiar to the U.S.? I don't mean this lewdly, but: I would imagine parents everywhere appreciate the ability to clean u

Is the ubiquity of "master bathrooms" peculiar to the U.S.? I don't mean this lewdly, but: I would imagine parents everywhere appreciate the ability to clean up after sex without having to first walk though the house's public areas.