If there's one thing we don't need any more of in this life, it's rules! Let people do what they want. If someone is engaged in truly unethical behavior, it will come to light and we as a group can ostracize them, or ban them or whatever. But please, no setting up rules to regulate behavior along with the requisite behavior police to tell us all how to behave. People with common sense and reasonable ethics can pretty much figure these things out on their own without someone policing them.