The NSFW tag is used in e-mail, videos, and in discussion areas (such as forums, or community websites) to mark stuff which contains material such as nudity, pornogrophy or profanity, which the viewer may not want to be seen accessing in a public or formal setting such as at work.
I really dont see how that photo is nsfw. Now if you want to see some examples of truely NSFW photos... come with me to /b/
could it be possible that this calender isnt intended for the younger audience? its like lindsey lohan going from disney to playboy... just not as extreme and alot less drugs.