There are several reasons why you cannot have intercourse before hysteroscopy: 1. fear of infection. if you do not pay attention to cleanliness and hygiene after intercourse, pathogens may infect the uterine cavity and fallopian tubes through the vagina and cervix upstream. 2. fear of pregnancy. if you do not take good contraceptive measures, sperm may enter the fallopian tubes through the uterine cavity. If pregnancy is found after hysteroscopy, only abortion can be performed, which can cause damage to the endometrium. Hysteroscopy is usually required to be done 3-7 days after menstruation. It is mandatory if there are endometrial polyps, submucosal fibroids, endometrial thickening, etc.