Like some of the users have said before me, I do not believe the implementation of a mature board would be a good idea. Feralheart is a place where all ages (13+) can mingle together, not to have certain age groups shut off from part of the community. If such a board were to be added, there would always be the trouble of creating a new set of rules to go by, and even that doesn't ensure that everything will go smoothly. The Staff members already have quite a lot on their plates, and so having another board that may very well require heavy monitoring might not be the best thing right now.
If users wanted a place to discuss mature topics, they could always go elsewhere for that. This forum just isn't the place.