<human>: Can you give me the gist of the text in a nutshell?

Until today all difficulties we have encountered have been met with understanding, tolerance and alternative options which have worked. However, today we were presented with a new problem which I need Reddit's help with... a little background first.

   My son is 11 years old and autistic from birth. He is non-verbal and does not perceive words as communication. He has learned very limited sign language but only relating to his immediate wants and needs. He cannot express himself emotionally except through violence to himself when angry or wild unchecked behavior when he is happy. Conversation is lost on him, although he does enjoy being talked to.

   Now to the problem... As I said he is going through puberty. it's hitting him hard. He has begun masturbating in his room with his door open as he does not understand boundaries or acceptable behavior in society. The only remedy to this I know is to try and tell him that he needs to close his door and do this in private for obvious reasons. Today it became a problem.

   When he got home from school today his bus driver had a disgusted look an her face and her assistant was busy with the paper towels and disinfectant working furiously to clean the seat he was sitting in. As I approached the bus she informed me of his extra-curricular activities on his trip home from school. This was the first time, but it doesn't take a genius to know that it wont be the last.

   To the question... Does anyone have any suggestions as to how to help him get control of this or make him understand that this is not acceptable behavior outside of his home? I though about taking him to and from school every day, but we are limited financially and already stretched paper thin with a vehicle I dread driving just a few blocks. My thinking is it's just a matter of time before this starts happening in the middle of class. Once that starts he will not be allowed back into school until this issue is dealt with. 
   Any suggestions would be greatly appreciated. Thank you in advanced. :)
<bot>: my 11y-o non-verbal autistic son has hit puberty and is engaging in inappropriate behavior at school and on the bus ride home. Any suggestions as to how I can deal with this?