This document discusses the ethics of virtual reality (VR) and how VR environments can raise new ethical issues. It provides examples of how VR is used for training, art, therapy, and entertainment. While some VR worlds try to mimic real life, others provide more alternatives or few limits. This can create ethical problems related to issues like limits, content suitability, economics within VR worlds, and matters that could not occur without the connection between virtual and real identities/actions. The document analyzes specific problems in VR worlds like Second Life, such as an example of a "lesbian marriage" between users that turned out to involve a man deceiving a woman about their real gender.