Content that would be prohibited offline by the BBFC (British Board of Film Classification), making it illegal to own on DVD or Blu-Ray, is readily available on mainstream pornography sites. The BBFC will not classify any content as R18 if it is illegal, or material that is potentially harmful – for example because it depicts and/ or promotes child sexual abuse, incest, trafficking, torture, and harmful sexual acts. It includes material which promotes violent sexual activity, including breath restriction (strangulation), gagging and forced penetration, and depicts sexual activity with adult actors made to look like children: petite, young-looking performers made to look underage through props such as stuffed toys, lollipops and school uniforms. It also includes content which depicts sexual activity between family members, such as between fathers and daughters and brothers and sisters. This content is extremely harmful, promoting violence against women and girls, and sexualising children. Yet online, it is easy to view free of charge and currently lacks age-gating.