the marketplace has a recent censorship program which is loaded up with unknown words and letters - if these words or letters appear in your item description or keywords then it will automatically be changed to adult. you have to go through your listing and change the wording until it accepts your "general" listing - suspect words can be things like sexy, slave, child, etc, or even more benign so it is a guessing game, but once you hit the word and change it you will be able to change the censorship level of your lisitng - not the cleverest idea ever eh?