If the menstruation is not completely clean and there is still a little bit of menstruation, it is not allowed to have intercourse. During this period, the cervical opening is still open, the uterine lining is not fully recovered, if coitus is prone to gynecological inflammation, such as endometritis, or more serious pelvic inflammatory disease, or adnexal inflammation, these gynecological inflammation in addition to may cause discomfort, leucorrhoea increase, lower abdominal distension, and may be secondary to infertility, so it is not advocated that coitus is not during the onset of the menstrual period, wait until after the menstrual period is fully clean. So it is not recommended to have intercourse during the period of menstruation, it should be waited until the menstruation is completely clean. Before and after intercourse should pay attention to both external genitals clean, if there is no plan to get pregnant, should also pay attention to take reliable contraceptive methods, such as condoms or short-acting contraceptive pills, to avoid unwanted pregnancies, because abortion can also cause great adverse effects on the body.