Kids are likely to be exposed to porn on the internet before they are 12-years-old. It's important for you to talk to your kids about porn. Discuss your feelings about porn along with your concerns like addiction to viewing porn, objectifying women, portraying violence towards women and the link to trafficking girls for sex.
The book Good Pictures Bad Pictures is a book you can read together with your 6 to 13-year-olds. Sexploitation: Helping Kids Develop Healthy Sexuality in a Porn-Driven World will help you talk to your teens.