To investigate the relative effects of hormonal and relationship factors on female sexual function during the natural menopausal transition. Design was Prospective population-based questionnaire study. Setting: Interviews were conducted in the patients' homes. Patient(s): 1458 women from 12 european countries aged 45β55 years who were still menstruating at baseline. Hormonal levels, age, menopausal status, partner status, and feelings for partner were measured and evaluated with longitudinal structural equation modeling. Main Outcome Measure(s): Short personal experiences questiom