Context
Reddit is purging NSFW subs as well as trans-related subreddits
And a screenshot of the post on Reddit, from which the meme is quoting:
Brace for Rexxit 2.0. This is not drill! Granted, most of the Redfugees will be going to Lemmynsfw (I helped by dropping a link in, we'll see if that lasts) but as long as we get them out... I suppose you could call it missionary position work.
https://en.wikipedia.org/wiki/Rule_34
Or you can Google Image search it.
Not today Satan.