SnowWolf said:
Generally speaking, I see the following tags here

1. No genitals, only an anus - Aka, the topic of these posts genital-less? anus_only? no_genitals_only_anus?
2. Only_anus_exposed?
3a. ...some combination of Presenting_anus + something else?
3b. Pussy_tape

1. It's so messy that I'm not sure if it can be salvaged, but I'd keep anus_only for this. Since the usage is quite similar to the planned clothing tag changes (naked_hat -> hat_only, etc).
2. For the most part, this seems searchable with combos. Especially with the addition of butt_focus. Not sure if a new tag is needed.
3. Searchable with presenting_anus pants_down and such.