This document discusses the ethics of teaching in immersive virtual worlds. It outlines some risks such as students not taking it seriously and negatively impacting learning, issues around student embodiment and exposure, and potential for "griefing" and crashing simulations. It also presents an ethical dilemma about some students refusing to participate due to discomfort. Some possible responses are presented, such as allowing objections, contesting a right to not be offended, making participation optional, or ditching virtual worlds altogether. References are also provided.