Who decides what's NSFW? Whose work? In some cultures (including "Western" subcultures), people find it shocking for women to wear pants. (They take Deuteronomy 22:5 seriously), does that mean you cannot write the "the women in jeans" without marking it NSFW?
I'm not advocating anything goes, not at all. But there are limits on restraint - and furthermore, if you work at a company where you can get into trouble for reading the word "spread eagle", you should take some responsibility as well. Perhaps you should refrain reading a site that consists almost exclusively from uncensored posts.
BTW, I live in a country which has a freedom of religion, and where carrying firearms is usually forbidden. Do you think that anyone thread that mentions 'gun' or 'god' should be marked "NSFW"?
I've also a practical question. Say, I post an innocent question about arrays, should I mark the question NSFW just because someone may followup with a post that contains the words "spead eagle"? After all, if someone clicks on my post, (s)he might have to explain the followup to her/his (fe)male HR representative.
Oh, and why is the gender of the HR representative relevant? Are you allowed to read more if your HR representative is male? Isn't it sexist to suggest female HR representatives are more draconian than male HR representatives? Heh, perhaps your HR representative has something to say to you tomorrow.