I would say tags over categories.

Let’s take Lucky Pierre for example - it can contain mmm, mmf, fffm, mmt, mft, and a whole variety of other variations.

Should it just be under a bisexual umbrella? What about the all male or all female content? Or all trans? It doesn’t fit into a clean category, but individual posts may.

So some may need to go under multiple categories with this structure.

I created !not_so_gentle_femdom@lemmynsfw.com and !femdom_community@lemmynsfw.com on here, so feel free to add that in.

My 1 question, is how do you want to differentiate “community” subreddits from “fap material” subreddits? Ideally, I think they should be categorized too, but denoted in the list that they aren’t intended for porn. Another example of this might be the old sextoys subreddit where people asked questions about toys.

I feel that having its own top level category would be less organized than having it in line. Maybe doing something like:

3.1 - femdom
  3.1.0c - femdom_community
  3.1.1   - gentle_femdom
  3.1.2   - not_so_gentle_femdom

Where the c indicates a community style board (well, community, but the terms a bit overloaded in this context)