The male sex industry is a topic that provides both opportunities and challenges for researchers and society. Consistent, reliable data will help us understand more fully the demographic diversity of MSWs and their clients. Additional study will enable society to openly acknowledge that the male sex industry is larger and more widespread than heretofore believed, and that enormously diverse sexualities and sexual practices prevail. Increasing our knowledge of MSWs will help us learn more about the meaning of masculinity in the context of transactional sex and may have a critical impact on our understanding of sexual relations in the context of gender roles. The male sex industry will continue to create considerable challenges in the broader society, and some policymakers are responding creatively to issues related to public health, homosexuality, and the professionalization and commercialization of the male sex industry. One thing is certain: we can confidently say, as this book attests, that the male sex industry—which includes highly diverse men of all colors, shapes, and sizes who sell sexual services—deserves significantly increased funding for future research on the basis of public health alone. We hope this book will open new doorways to that future.