A quick look in the MP under section millenium kids seems to have a large amount of textures that are descibed as "All textures are based on photography" or "Textures are made from origional digital photographs" or similar. In the Victoria section a lot of the characters look young and could be under 18. You have no way of knowing. So why would you not ask for age verification in these cases. You may well be selling texture sets where the models are 18.