I have an 8 yr. old student who stands and masturbates on the edge of his desk. He does it 6 to 8 times a day. I am constantly asking him to sit down and stop doing that. He says he's not itchy. I asked him if he could control his behavior and stop doing what he's doing. He said,"yes". Then he went to his desk and was doing it again a few minutes later. Is this considered normal?