Yes, but if I were a cat I wouldn't lick my own anus and yet cats happily do that - my opinion on what I would or wouldn't like as a cat is not really relevant.
My point is - we are not cats, and cats aren't humans. They deserve good treatment, respect and all the love they can get - but at the end of the day they are not humans and should not be treated as such.
Friction and liquids? Seems pretty much like the wet wipe used to clean my countertop - only a different friction material, and a different liquid solvent.
That's as serious of an answer as I can give. It's the same reason I never neutered my cats, since it felt like a mutilation.