Just to note, a lot of those board hosts (proboards especially) take language/violence/x-rated material far more seriously than IJ does as far as flagging & terms of service go. If a user (anon or member) flags one person's post for using crude language or getting too gory for their tastes, it could take down the whole rp board. I feel an MA rating, NSFW caution, or HBO-appropriate tag works fine for IJs purposes considering you don't have to take the same precautions on someone being shocked and getting trigger-happy on the host-alert front.