Is that true?? In the US?

My instinctive metric[0] for NSFW is: Could a casual passerby see something that falls into a class of designated offensivenesses (e.g. sex of any kind, but not violence unless it's also sexual)?

Text in a giant font could certainly qualify. But I would not think that ordinary-sized body text would be problematic -- if the passerby has to pause and snoop, they are breaking other equally-important protocols to ascertain SFW or lack thereof.

0: I have not run this by an HR department, and I've worked from a home office for more than twenty years, so I may know nothing of which I speak!