Well, grasshopper, man is the only living creature that God made that needs toilet paper(in some form)... No other living mechanism needs it... And to make sure you are clean you must look at it.
Well, since man is prone to arrogance, must be Gods way of insureing that man takes a look at and gets a noseful of his real days production, humbling him, unless hes too busy thinking up other arrogant thoughts..
Well, master, why does God require the rabbits to eat theirs? They already seem pretty humble.
(grasshopper) Hank