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The thing about not having others hear you pee is even stronger in Japan, where they saw the need for a technical solution: in many japanese public toilets there is a device called Sound Princess (dunno if there are other brands) which will either on the press of a button or automatically, generate an artificial flushing noise. This became necessary because previously, many women used the real flushing noise for the same purpose, flushing throughout the whole business and wasting a lot of water.