My son 4.5 years old came home from school reception class the other day and said some things which I found very disturbing. An example of which was that few children in his class took their clothes off as part of some sex education exercise by teachers. While I am aware that my son could be confused as he is very young, and I know that what he was describing, including children touching private parts . Model girl child and model boy child were hiding their faces in their hands as they were embarrassed. My son knows the names of teachers and children who took part in this exercise. I am very strong woman but I am confused right now as common sense doesn't accept that it can happen in the children's school in such a young age. what sort of action I have to take ??? I am already writing a letter to head teacher asking her more information about it. What else I can do ? Is it a normal or Should I be worried ?