The reason for the late addition of bathrooms to B&B and inn rooms is that until relatively recently guests would be expected to share such facilities. Nowadays en-suite facilities are expected, as are tea and coffee making facilities and a colour TV. Last year we stayed at a cheap commercial hotel in Belgium where the toilet facilities were shared but private showers were provided by plonking down a huge plastic cubicle in the corner of the room with no pretence of seperating it from the room.