Well, I guess we all heard about ff.net's idea, right? Personally, I think it's a shame to lose or cut some good fics just because they don't like the content. So I created a forum (yesterday) which allows K, T, M and MA rated stories if they are submitted on the right category. It's easier to understand if you see it:
inmyworld.myforum.ro
I couldn't put .com, but it's in English xD
See you there!
PS: I would appreciate if you share this message because only like this we can populate the forum and have some great stories/arts which can be red whether the rating they have.
Thank you ^.^