The NSFW tab is for folks like me who refresh E! near all the time and might not be in the most ideal place to read naughty time.  The other day my son decided to park it behind me to watch me play X-Com when I was pausing between paragraphs to write.  Could not go back to the story.   Or three are public WiFi out there at work and such which don't have E! blocked.  Merely gives a person pouncing on a new chance to mentally say<em>oh shite</em>and hitting back space before being put in an embarrassing situation.  90% of the time not read or needed but there for those other times.