Actually if you call through API instead of browser chat bots and desktop apps, the censorship is much more muted. I know at least Deepseek has no problems handling NSFW written material, so that should help greatly in AVN coding. As for animations, yea still no way to generate adult stuff on mainstream models to date.
You might be better off just setting up your workflow on something like ComfyUI cloud and just pay for server usage rather than buying exorbitant GPUs like 5090 which is so ridiculously overpriced that you'l need to generate tons of animations to break even.
Even the best 5090D can only host at most a heavily quantisized ~30B model, so it's gonna suck badly at agent work, not to mention much slower. It makes more sense to subscribe or buy tokens on the go IMO. Just give it a try, but $5 worth of tokens from Deepseek or Mimo (2 cheapest mainstream models) and give it a try.