This document discusses the potential uses of 3D virtual worlds in healthcare and health education. It begins with an introduction to virtual worlds and examples of possible uses, such as distance education, simulations, skills training, and social networking. It highlights the realism of human interactions enabled by avatars. A case study describes a virtual world sexual health simulation. The document envisions the future 3D web/Metaverse becoming the dominant internet interface and increasingly integrated into daily life through standards and interoperability. It suggests activities like exploring health-related areas in Second Life.