I don't think there is one. At least going from the fact that I don't see many federated nsfw instances here at all, but maybe I haven't looked hard enough.

Tbh the legal and practical ramifications of hosting porn (particularly the borderline-legal kind) means that this is probably not going to be easy to get going for anyone living in a western country. I wouldn't get my hopes up too much for your friend.

EDIT: There's not. That's a real shame because even drawn CNC is verboten now, and I've had an incest caption removed today (no reason provided, but I'm assuming that since IRL incest is non-consensual by definition then it might be (partially?) verboten as a fictional kink as well).
I know I will hold off on contributing here for now until the content policy stops getting expanded every week. I had assumed "reddit-like" rules would apply, but they're already significantly stricter and there's no point in submitting niche content that will get removed down the line.

I mean, I get it from the admins' perspective. But from a user/contributor's perspective I really really hope they can figure out a way that we can still aggregate content that was previously allowed on reddit, else I hardly see the point of migrating.