NSFW stands for Not Safe For Work, meaning you probably shouldn’t look at it if you’re at a location where others can see what you’re doing. Especially if you’re liable to be fired for looking at things you’re not supposed to.
What kind of NSFW posts are there?
You’ll find a variety of game reviews that are NSFW, such as the following:
Furry – Anthromorphic people–think werewolves
Futanari – Women who also have male genitals
Sexual content – Typically includes nudity, sex, and lewd language