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Old Jun 29, 2008 | 5:56 am
  #3  
ninja138
 
Join Date: Jun 2008
Programs: UA, AA, WN, 7G, SPG (for now)
Posts: 513
It's a "modesty" button. There's a widespread habit of people (not just Japan, BTW) flushing the toilet to mask the noise of their farts. This practice, of course, wastes water. So, to have the same effect without the waste, the latest premium models have a "modesty" button.
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