Many of us don't wipe. We wait until the stink gets to bad and then we take a shower or use the local swimming pool. Taking a crap is an adventure for us fatties. Unleashing a big steaming dump is one of life's great pleasures for a fatty but like they saying goes, "No job is finished until the paper work is done."
To do the job right you need the right tool. The butt wand has been a lifesaver for fatlings. Reaching back there is impossible for most fatlings and going in from the front can also be impossible. Fat girls who go in from the front also give themselves raging yeast infections.