By the way, I added an actual {nsfw} tag a while back that works kind of like the spoiler tag. It can only be used for images (no text) and doesn't load the image until you click on it, so those who are nervous about images being cached on their computer at work don't have to worry about it.
That said, this should NOT be used as a way of hiding full frontal or anything like that. Those should be linked as usual. This is a decent way to hide things that are a little iffy, though, such as images with profanity.