1. Clinic of Psychiatry and Psychotherapy, Outpatient Department for Sex Therapy, University Medical Center Essen, Germany
2. Institute for Family and Sexuality Studies, Department of Neurosciences, University of Leuven, Belgium
3. Department of Psychiatry and Psychotherapy, University Medical Center Göttingen, Germany
4. Faculty of Health and Society, Centre for Sexology and Sexuality Studies, Malmö University, Sweden