Surgical modality and receipt of chemotherapy or radiotherapy are not associated with sexual function, as measured by the Female Sexual Function Index (FSFI). Patients receiving endocrine therapy with an aromatase inhibitor had significantly lower sexual function scores than those who received no endocrine therapy or those on tamoxifen, said a group of U.S. researchers who presented their findings during a poster session on Saturday, December 10, at the San Antonio Breast Cancer Symposium.