David L. Rowland, PhD, is Professor of Psychology and Dean of Graduate Studies and Continuing Education at Valparaiso University in Indiana. He is also Editor for the Annual Review of Sex Research, and serves as consulting editor for a number of journals. He has published numerous research and review articles related to sexual response, evaluation, and dysfunction.

Luca Incrocci, MD, PhD, is a radiation oncologist and sexologist in the Department of Radiation Oncology at the Erasmus Medical Center-Daniel den Hoed Cancer Center, Rotterdam, The Netherlands. Dr. Incrocci is a member of the Editorial Board of the Journal of Sexual Medicine and the European Journal of Sexual Health, as well as the Treasurer of the International Society for Sexual Medicine. He is the author of more than seventy peer-reviewed papers, reviews, book chapters, and abstracts. sexual and gender identity disorders