You know that big wall of text that you get when you first load the game that you have to scroll all the way to the end before you can hit accept and move on. Thats the EULA and in it states that offensive names will not be permitted. So the OP is correct in asking you all to be a bit more adult when you select not only your toon name but the names for your retainers. And should you choose not to don't be surprised when you get that nice little GM Message telling you to change your name or be prepared to be banned.