I take issue with your description of /r/jailbait. None of the images in that subreddit qualified as child pornography under the definition of child pornography on the Wikipedia page.
1) whether the focal point of the visual depiction is on the child's genitalia or pubic area;
2) whether the setting of the visual depiction is sexually suggestive, i.e., in a place or pose generally associated with sexual activity;
3) whether the child is depicted in an unnatural pose, or in inappropriate attire, considering the age of the child;
4) whether the child is fully or partially clothed, or nude;
5) whether the visual depiction suggests sexual coyness or a willingness to engage in sexual activity;
6) whether the visual depiction is intended or designed to elicit a sexual response in the viewer.
Opinion: http://www.mit.edu/activities/safe/cases/knox/94a0734p.htm