I think it has something to do with you're hopeful they take a shower at least every other day but with a floor you don't know. And so many people and animals walk on it and cats use the litter box, dogs can step in their own poop, humans walk on a lot of things so it's just not ideal.
I wash my genitals every day and I typically know where they have been. Floors, however, has all sort of things interact with them. Including my shedding dog who was rubbing himself in the dirt an hour ago.
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