NSFW - A photo is deemed (Not Safe For Work) NSFW if it is: explicitly sexual in nature (suggestive), overtly tasteless and/or Slandering to any person or ethnicity.
In addition to the above criteria, if a photo is a primary photo, it will be flagged as NSFW if it also contains a suggestive body part without the member’s face in the photo. If you have a borderline photo that is not considered NSFW, and it was marked as such, there's a chance someone who has ripped that photo is using it as a Primary Photo. Remember: The Bouncers will be STRICTER with those used as Primary Photos.