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Leaving the bidet on "feminine" mode is the female equivalent of leaving the toilet seat up.
(m.media-amazon.com)
My wife does this all the time, and if I don't check before I spritz I get an unexpected ball splash.
NSFW for potential topic sensitivity I guess.
This might be different in mostly wooden homes like in the US, but here with stone homes the majority of the noise of flushing comes from the actual water rushing into the bowl plus the tank beginning to refill. The actual drainage causes virtually no noise.