No. This is not normal behavior. I would start by really evaluating when this behavior began. Also consider what other behaviors your son may be engaging in or displaying and at what point those may have began, for example sleeping with his door closed, when he used to sleep with it open or vice versa, being uncomfortable with other people - adults and/or other children - when previously he was not, being withdrawn or the opposite - more outward-behaving, difficulty at school, either educationally, behaviorally or socially. Often, a physical (often sexual) or emotional trauma triggers the onset of behaviors such as this. Have you ever or do you allow your son to use public restrooms (other than at school) unaccompanied? I know this sounds like a lot of areas to evaluate, but there are many possibilities as to why your son is acting out in this way. He is obviously not able to discuss what is causing this behavior with you and/or your husband, probably out of fear or embarrassment. Does he have any other trusted adults with which he could speak - Youth Pastor, School Counselor...? If not, I would strongly urge you to find a qualified child psychologist or psychiatrist with which he can speak. Regardless of why he is exhibiting this behavior, he is seems to be either crying out for help for some reason or suffering from another disorder. I hope this helps and I am wishing you luck, and praying for your family, for clarity and a solution....