I'm wondering if this may already be illegal in some countries. Revenge porn laws now exist in some countries, and I'm not sure if the legislation specifies how the material should be produced to qualify. And if the image is based on a minor, that's often going to be illegal too - some places I hear even pornographic cartoons are illegal if they feature minors. In my mind people who do this shit are doing something pretty similar to putting hidden cameras in bathrooms.