You should not have intercourse before the end of your period. Intercourse before the end of menstruation, or just after menstruation, can have adverse effects on women’s health. A. Intercourse just after the end of menstruation, or at the end of menstrual period, although not pregnant, but easily lead to gynecological diseases, such as endometritis, pelvic inflammatory disease, cervicitis, easily lead to increased leucorrhea, abnormal color, itching, odor and other symptoms, and even abdominal pain and lumbosacral pain symptoms. Second, affect the normal reproductive function of women. Intercourse before the end of menstruation may induce the production of anti-sperm antibodies in the body, causing immune infertility. It may cause endometriosis, leading to tubal adhesions and pelvic adhesions, thus causing infertility.