Mods can’t edit posts here, even to add things like the nsfw flag, so it would definitely need some strong moderation.

The admins of this site have added some basic mods onto the default Lemmy code (like nfsw-by-default), but I don’t think they’d want to develop tags as its own feature.

I think [tagging] would be good, even if it’s not currently supported on Lemmy.

There was https://pornlemmy.com/ but looks like that’s gone now.