This guest editorial is dedicated to introducing the First European Bisexual Research Conference, its theme, and, most importantly, the contributions to this special issue. I briefly discuss the specific context of this conference to explain its European focus, embeddedness in Dutch bisexual activism, and its standing on shoulders of giants (in particular the UK Bi(Re)Con). Secondly, I introduce the theme of the conference, (inter)national research frontiers, which reveals our conviction that contact zones are key to further advancing bisexual theorizing and connecting these studies with broader disciplinary and, sometimes, interdisciplinary theories of the social sciences. Thirdly, I provide a short picture or impression of the conference itself to show the diversity in contributions and research frontiers. Finally, and most importantly, I discuss relevant research frontiers to contextualize and introduce the contributions of this special issue.