This is one of the hardest things for adolescents with developmental delays or mental retardation - appropriate sexual behavior.
I'm really very surprised though that his teachers aren't helpful and don't know how to react to impulsive behavior in your son.
Here is a link to the ARC in Milwaukee - I feel sure they will have resources that will help you. This is a VERY common problem among teenagers with developmental disabilities.
Boys in the mainstream population struggle to behave appropriately, and it's doubly harder on boys like your son.
Best wishes.
http://www.arcmilwaukee.org/
ARE YOU KIDDING ME???
the teacher is not much help? do you know the number of students this teacher has the responsibility of each day? is he 1 of 2, 1 of 5 or 1 of 15?
Currently I have a student who is 100% concentrating on woman's breasts and will cross any barriers to touch them, woman, classmate etc. I have 14 students all with Mh needs, when does the teacher get help? and the teacher have the ability to say I cannot do this?
I think rockrose gave excellent advice to this post that is very old.