For parents, starsinmyeyes writes about how you can protect your child from sexual abuse.
And Amanda Hess of the Sexist has advice on how bystanders can help groping victims. I totally agree with the advice of making it visible, making sure the harasser knows there are witnesses and making the victim feel safer.
I think our job as bystanders, as parents, as decent people, is to help create an environment that potential or actual victims feel safe in. Where they can scream for help and expect help, where they can speak out against their harassers or about their abuse and be listened to with empathy and respect.