the sound of peeing is the sound of water coming out. water is nice,
it's natural, it's great. imagine if waterfalls were ashamed of their
gushing sound. i mean they would all dry up.
the sound of peeing is not like the sound of breaking wind. fart can
sound funny because air squeezing thru a tight hole sounds like a
circus trumpet.
but, what is wrong with the sound of pee?  pee is the sound of
serenity, of a purty librarian going 'shhhhhhh!'  fart is farcical,
pure and simple.