The treatment of breast cancer as well as the disease are responsible for genito-urinary symptoms that can persist over time and impair quality of life. Given the improved prognosis of breast cancer, more and more patients are confronted with specific post-cancer issues, and the care has become a major health challenge. Sexual health is a crucial component of well-being and overall quality of life. Vaginal dryness and dyspareunia are symptoms frequently found in patients treated for breast cancer, with chemotherapy and hormone therapy as risk factors. However, the treatment of sexual disorders remains underdeveloped in France. Vaginal dryness is part of a broader syndrome known as genitourinary syndrome of menopause (GSM), or vulvovaginal atrophy, which may combine vulvovaginal (dryness, irritation, burning), sexual (dyspareunia) and urinary (infections, pollakiuria, urgency) symptoms secondary to hypoestrogenemia, exacerbated by breast cancer treatments. Since hormonal treatments are contraindicated, the first-line treatment for GSM in patients treated for breast cancer is the application of non-hormonal trophic treatments (regular vaginal moisturizers, lubricants during intercourse). However, these treatments are often insufficient to provide effective relief. There is therefore growing interest in the development of second-line treatments for GSM : intra-vaginal hyaluronic acid injections, laser, photobiomodulation (PBM), etc. PBM using Light Emitting Diodes (LED) has been proposed as an alternative treatment for genitourinary syndrome of the menopause. The tissues are exposed to light sources in the visible spectrum, inducing non-thermal, non-cytotoxic biological effects that improve vaginal tissue trophicity. In line with previous studies of sexual quality of life carried out at the center, and in the context of the recent establishment of our multidisciplinary network for the 2nd-line treatment of genitourinary menopausal syndrome with Photobiomodulation, we would like to carry out a descriptive study of the sexual QoL of patients undergoing treatment for breast cancer and benefiting from this oncosexological support.