Coitus is not recommended clinically at 39 weeks of pregnancy, mainly to avoid premature rupture of amniotic fluid and intrauterine infections and other undesirable conditions that can affect the health of the mother and child. 39 weeks of pregnancy has reached the full term of pregnancy, the corresponding stage of the cervical canal has matured, at any time may start the labor process. During this period of time, coitus may easily cause premature rupture of membranes, which may further cause intrauterine infection and other adverse consequences. It is clinically not recommended to have intercourse during this period to avoid the emergence of related conditions, which may affect the fetus itself or the physical condition of the pregnant woman. At 39 weeks of pregnancy and other corresponding stages, we should pay attention to closely observe the physical condition of the pregnant woman, once the water breaks, redness and regular contractions, etc., we need to be admitted to the hospital in a timely manner, and found that the process of labor is initiated, we should carry out standardized care under the guidance of the clinician, to avoid causing unnecessary damage.