If a woman still has a little bit of menstruation, it means that the menstruation is not completely clean, and it is not possible to have intercourse at this time. If the menstrual period is not clean, it may cause gynecological inflammation, such as endometritis, pelvic inflammatory disease, adnexitis, etc.. If the menstrual blood backflow, it may also trigger women to endometriosis, only after the menstrual period is completely clean before intercourse, during the intercourse must be good contraceptive measures. During menstruation, you must pay attention to not eat cold, spicy and stimulating food, but also pay attention to keep warm and not catch a cold, and pay attention to more rest.