Few studies have been carried out concerning the influence of bariatric surgery on female sexuality and hormones, particularly utilizing hormone-based questionnaires. The effect of bariatric surgery on sex hormone levels, sexual function and health-related quality of life (HRQL) in women was analyzed in this study. Participants were included in a single-center study at a regional hospital in Sweden, with a duration of one-year follow-up.One hundred non-smoking women, undergoing laparoscopic Roux-en-Y gastric bypass, were included in the study. Blood assay for sex-hormone binding globulin (SHBG), testosterone, estrogen, progesterone, follicle-stimulating hormone (FSH) and luteinizing hormone (LH) was analyzed. Participants completed the Female Sexual Function Index (FSFI), Women's Health Questionnaire (WHQ) and Psychological General Well-being Inventory (PGWB) parallel to lab testing.At one-year follow-up, several significant results were found concerning hormones and questionnaires. Testosterone decreased and SHBG increased, N = 68/100. Desire, arousal, orgasm, satisfaction and total score domains for the FSFI increased after one year, N = 53/100. WHQ domains concerning depressed mood, somatic symptoms, memory, anxiety, sexual behavior and attractiveness improved after one year, N = 47/100. All domains in the PGWB (N = 52), including anxiety, depressed mood, positive well-being, self-control, general health, vitality and total score improved at follow-up. Spearman's Rho coefficient analysis found correlation between testosterone/WHQ-sexual problems (0.3), SHBG/WHQ-general health (0.3) and SHBG/FSFI-arousal (-0.3).Bariatric surgery normalizes levels of sex-hormones in women, and results in improved sexual function, health-related quality of life and psychological well-being.