Personally I would look at flagging posts as a courtesy for people who may have some issues with an image. So I have always worked on the basis of "when in doubt, bow to the action which is most courtious". So even if an image may be of no offence to (or even to a majority of the people), on the chance that one person may be offended, it doesnt hurt to put the flag up....and someone may appreciate it. I dont think anyone has ever been grossly offended by having a flag on their post. LOL