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I don't think, it is only a "cartoon's girl". It is not a real girl and I don't think that you can't categorize it just NSFW.
just my 2 cents.
If thats a common view here I can accept that and just stop reading from work, but I know when I scroll past that and my boss in behind me I will have problems.
Maybe turn avatars off if it's going to be a problem but won't he have a problem with you not working? I can't imagine most bosses being okay with their employees browsing forums during work.