i was thinking the same thing
Depends on the location of the toilet, in a private toilet you would expect to find such things as towels etc so i would expect anyone who had no paper in that sitution to wash and dry.
But in a public toilet in the UK you don't have towels etc, you have a hand drier which is about 4ft off the floor so how would you dry ur ass after washing without looking extremely wierd if someone walks in