At least one so-called "grey area" involves teenagers wearing revealing outfits or posing in potentially sexual ways. As far as I understand it most police for

At least one so-called "grey area" involves teenagers wearing revealing outfits or posing in potentially sexual ways. As far as I understand it most police forces do not waste their time with such imagery, even though it may technically be illegal, because there is just so much unambiguous child abuse imagery to deal with -- teenage girls taking pictures of themselves is a lot less alarming than a 40 year old filming himself abusing a 3 year old.