I don't have time to read through 13 pages, so my apologies if this has already been beaten to death. Rather than needing to get people to categorize their writing, have two mandatory questions during upload: "which genders are present sexually in your story?" and "Which genitalia are present sexually in your story?"
Then allow users to filter within those two categories simultaneously, completely eliminating the need to have a bazillion confusing categories for all the different combinations.
And then categories that are actually just tags you can further filter with, and we authors just tag our stories.
I am constantly confused as to why the current erotica sites don't already have this. It's so obviously the way to give readers the most control over which stories are presented to them, and it's the most socially just option for trans and gender non-conforming people.