I told both of my sons about my PMO struggle. I waited until they were about 12-13 to do so. Before they got to that age, I was not sure a way to communicate it to them in a way that made any sort of sense. And, maybe I was not ready to do so yet myself. We are now partners in purity, and we speak openly and frankly about this issue as it comes up. The Internet is an amazing place, but it has dark corners. My children are well aware of the dangers, and we shine a bright light on anything that comes up. Secrecy and silence are what give PMO power, and we have robbed it of both in our family.