I am new here, so perhaps I should't be piping in on this discussion.. But here goes anyway.

I've read the Nfic at Anne's place, and it seems to me that the only difference is that the sex is more graphic. In fact, it's true what other people have noticed -- some stories are JUST sex (which is quite dull ).
I don't see the need to create more categories. The story descriptors here are quite accurate and provide a good guide as to violence, WHAM factor etc.
This is a well behaved group -- just the fact that this discussion is going on proves that !
So in the opinion of this novice reader -- carry on as you are !

Allie