As an afterthought, the prevalence of futanari and how it compares to non-futa.

1. Comparing the Safe:Suggestive:Questionable:Explicit ratio in normal ponies, anthros and humans >>730750

2. Comparing the Safe:Suggestive:Questionable:Explicit ratio for different characters >>731154

3. Comparing the times a character is involved in an image tagged "Lesbian" or "Straight" >>731166

4. Comparing the times certain characters are tagged for breasts >>731214

5. Futanari (General) >>740752

6. Futanari (Comparing proportional frequency of depiction by character)
Without Maud Pie >>740958
With >>742839

7. Fetishes on Derpibooru >>748336

8. (Part 1) The 30 most prolific artists on Derpibooru by image ratings >>913513
(Part 2) The 30 most prolific artists on Derpibooru by image scores >>913544