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Recalling my delight at that time we stayed in a random AirBnB in Brighton that kindly provided a lock to ensure privacy in the bathroom
@Jwab How else can the owner's hidden camera see if you're trying to dodge the bath surcharge?
@Jwab Reminds me of the random hotel in Zürich I once booked on a business trip that had the toilet & shower enclosed in a partially obscured glass cube in the room.
No I did not realize the hotel was catering to couples why do you ask?
@Jwab from the IT security triad point of view, the lock provides Integrity, but not Confidentiality nor Availability.
@Jwab The need to upgrade the glass so that the key triggers the smart glass to go opaque. That would be cool.
@Jwab Ha ha ha ha ha 
@Jwab Ein Meme für Datenschutzablehnende: „Ich habe nichts zu verbergen.“
@Jwab in a way, it reminds me of the otherwise perfectly normal restaurant I went to in Brighton that had door-sized mirrors on the back of the toilet cubicle doors, and a long waist-height mirror all along above the urinals.