For science I just pulled up a few long-established pornography-specific subreddits (photo, video, and prose-based) in the current version of RedReader, the app which has been spared the axe by Reddit for now. I can confirm that the NSFW subreddits and individual posts still seems to be working and viewable in that app.
EDIT: Disregard, per reply comments this won't work after an update. :-P
There's an update that makes you login again. It installed for me yesterday. After the update get an annoying locked post from u/redditmaturecontent telling you to go to Reddit access NSFW content now.