Scholars have noted an increased reliance on extraterritorial criminal jurisdiction as a response to transnational criminal activity, the rise in treaty law, and the resultant moral obligations. Meanwhile, existing international legal commentary notes that there are difficulties attached to using extraterritorial offences as the primary tool to deter and combat Child Sex Tourism (‘CST’). While extraterritorial offences are recognised as one (albeit important) part of a spectrum of legal and socio-political sanctions against CST, serious obstacles remain to their effective implementation. Various scholars and commentators have identified the challenges involved in bringing charges related to extraterritorial CST offenses within the jurisdiction of the offender’s citizenship.  This article aims to contribute to the existing body of research on the application of Australian CST laws and the wider international debate concerning the utility of extraterritorial CST offences, and will address certain related controversies regarding the extraterritorial application of criminal laws, including those regarding sexual offences committed by UN Peacekeeping personnel.