The hazards of coitus when menstruation is almost over: vaginitis, cervicitis, endometritis, endometriosis, pelvic inflammatory disease, etc. may occur. Menstruation is the endometrium by the body of estrogen and progesterone levels cyclical influence, the functional layer of hyperplasia, secretion, peeling bleeding process, bleeding is not completely clean, the uterine cavity is still open trauma, the body resistance is also relatively low, sexual life is easy to lead to the invasion of the external pathogenic bacteria and induced by infections, uterine contraction, retrograde menstrual blood, and so on. You should pay attention to your personal hygiene and change your underwear frequently. Reasonable arrangement of work and rest time, to avoid heavy physical labor and strenuous sports, menstruation prohibit sex, bath, vaginal medicine, douching.