I know a lad who wouldnt wipe his arse till age 15.
We all lived in a terrace and the lad on one side of him and my sister on the other side used to hear him shoutin "mam come and wipe me arse"
In Finnish bodybuilding forum they did have long thread about this few years back, and some how it tell me it isn't so easy as we think it is. We, meaning people with at least average mental capasity. For example, there was many who doesn't wipe at all, plenty of those who wipe their ass standing up, and all kind of variations, different directions etc. so it seem to me it isn't easy at all for some of the people. And to make things worst I have a question: Which way do you wipe, to the front or back? Only one is right, so are you really capable to wipe your own arse?
