While I understand what you are talking about, there is a rule in the RP request boards that ALL NSFW images must be placed in link only and must be marked as such. No full images of the NSFW variety can be shown, such as what you may find in some Finders-Seekers threads. From what I understand, the RP request board being viewable to the public allows potential members to preview what sort of games may be available IF the become approved. The very fact that applicants cannot post in the board, only view it, helps give an idea of the wide variety of games that can be found on E, be they NSFW in focus or not.
Now, I am sure that an Oracle or someone else could give a better explanation, but that is how I understand it anyway.