Wait, I thought most AVN's used DAZ for their modeling. I kind of want to create my own AVN at some point and I honestly didn't know what software people used to make them. My favorite art style so far has been from Eternum.
Eternum is honey select or honey select 2 with the studio and around 200 gigs of mods. On steam the version is honeyselect2 libido, but then you have to research where to get all the mods to change it from a piece of shit (very limited and censored) to something decent. If you go the japanese version, you'll still need mods.
It's a sex simulator, but when patched you have access to the studio, and it's my understanding that, that is what's used to pose the games. That is all I know.