My five-year-old son has been caught playing “show and tell” with his genitals on several occasions, with two girls who are seven. While I don’t believe my son is completely innocent, I find these girls are incessantly trying to get him alone. I have spoken to my son, the girls and their parents, but can’t figure out how to make the behaviour stop. I’m running out of ideas and I don’t want to overreact.

We’ve always had an open-bathroom-door policy with our son, who is now four. At what point does it become inappropriate to dress or undress in front of your child?