That's right - I did suggest those not that long ago.
Incidentally, I was going to also suggest a cloaca female genital option - males have small, medium, large, horse & canine while females only have tight, average & loose - to round out the options but the only way I could think of to make it work right might require additional mechanics which would be more complicated then an alternate art option.
I'll post a summary of it in this comment in case indivi can find a use for it and happens to see it:
To keep things simple a cloaca is both female genitals & and anus combined and tends to show up on birds in real life - so pretty much when the game calls for female genital penetration or female anal penetration the same hole would use used (The difficult part I suspect would be how the game handles two simultaneous action calls for the same hole - do both happen ?, Is one picked and the other ignored ?, Does is error and/or crash ?), with the actual hole only visible when the characters anus would normally be visible (can could use the same art).