A 9-year-old boy put the moves on Anoreth when she was 10 (but short for her age :-). (He wasn't one of the shining stars of our Cub Scout pack, but that's beside the point.) The adults thought it was cute, "When is she going to start dating?" AAAGH.
That was when I told her that if *anyone* touched her, other than a handshake, or addressed her in a way she didn't like, she had our permission to be *really, really loud and rude*. She's never had to do it, but I know she will, if necessary.
Smart move, Mom!!!!!