That's right. The example you've been talking about (https://bitcointalk.org/index.php?action=profile;u=358121) is IMO completely safe. If the girl was naked, sure, but she isn't, and on top of that she isn't real, it's just a drawing.
Cartoons are also included in NSFW and how do you know it isn't real? What if an artist drew by looking a woman? What if it was converted to a cartoon image using a software? IMHO it is an NSFW content.
You can stumble upon much more exposed ladies when googling for important stuff at work, why aren't you worried about that. Also, if your boss is unhappy when he sees a drawing of a busty girl in a swimsuit there's something wrong with him, not the picture.
You do realise there are a lot of types of swimsuits. Like I said, "NSFW" will be different for different persons.
I may not care; but, a g/f of mine just saw the picture and told me it looks like a pedo's cartoon girl. 
Not sure if she maybe right, but i thinks it's something to reflect on.
Not sure if she maybe right, but i thinks it's something to reflect on. +1. Probably right.