The GMs in question removed the OP’s symbols on our direct orders. They were not acting on their own.
Our nudity policy is fairly permissive, however we do draw the line "below the belt." What this means is that we don't allow genitalia or sex. Incredibly form-fitting underwear or depictions of phalluses/sex toys are attempts to circumvent this policy through technicalities.
You can check out section 9 of our EULA for details, but we reserve the right to remove content that we deem inappropriate.
You can view Matt’s stance on the subject here.