they removed the r/nsfwrandom search string, and banned hundreds of the NSFW subreddits due to "lack of moderation." You can still go to many of them, (that remain) but you have to actively punch the subreddit into your address bar, and then you can only link to other related subreddits through the Subreddits' own link list (which is only up to date if you're lucky). Searching for them is still possible but access is a crapshoot due to the aforementioned subreddit bans.