There are numerous people worldwide who cannot be clearly assigned to a biological sex; they are intersex. Engaging with the phenomenon of intersexuality raises questions about boundaries and the authority over decision-making processes in the medical field. Not only can various treatment measures cause suffering for those affected, but also secrecy, discrimination, and exclusion. This volume gathers current foundational knowledge for a deeper understanding of the tabooed phenomenon and its various manifestations. International scholars, practitioners, and experts provide a nuanced insight into the controversial positions regarding the medical, psychosocial, and societal handling of intersexuality through trans- and interdisciplinary contributions. An informative appendix includes important information.