Originally Posted by
beep88
>> you might want to sit on a toilet seat in one of the smaller Japanese bathrooms.
The washlet control panel and the washlet toilet seat itself are waterproof and can survive a shower, as opposed to being splashed while one sits at the tub?
Not all the lower end hotels have washlets (as jib71's link shows). If there's a concern, then it's possible to ask if the hotel will unplug it before booking.
Looks like the OP is now veering away from the initial "can I shower" question.