Well, WS, there are still a few boards and threads that appear to have adult content publicly. These are mostly in the sub-forums. Take this, for example:
Cesarin
The artwork of Cesarin, predominately consisting of adult and artistic male nudes.
I've looked through that and cannot find any adult art currently, but the board still states that it is used for adult art. Something like that could easily cause all of Furtopia to be put into an adult category.
What we could possibly do is get the forums ready for a re-evaluation.