I believe that an escort has the ethical obligation to reveal their HIV status as a client has to reveal any relevant medical condition they might have (including HIV). It prepares everyone for the experience. Actually, and I am not sure if this could happen in the real world, would an escort look up a particular medical condition so they know the basics and feel more comfortable with the client. As a client I always make sure I make sure I tell what the relevant facts are and what a working guy should do in particular situations regarding the medical condition. It also makes me more comfortable. The only problem I always have is when exactly to present the facts.