Straight from the TOS:
*You may upload an avatar. No nudity, foul language, or anything that the staff feels is lewd, tasteless or offensive. When choosing your avatar, ask yourself this question: "Would this be seen on Network Television?" If the answer is no, then don't cry when the staff asks you to remove it. This is not a porn site or a place to view porn. It is a diesel site. If you want porn, search porn on Google, you will be entertained for hours.
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If you were asked to remove an avatar then there was a good reason and you probably already knew it wasn't gonna fly....so don't cry about it now.