The pregnant women whose indicators are stable can choose the number of times to have intercourse in the middle of pregnancy according to their own situation, and the movements should be gentle when having intercourse. In the middle of pregnancy, when the situation of the pregnant woman and the fetus is more stable, the development of the fetus is more stable, it is possible to have intercourse. Moderate coitus can also play a role in promoting the health of the mother and child. During sex, the mother-to-be is physically and mentally happy, and the fetus will also become happy. Intercourse during pregnancy can also improve the husband’s pain of being abstained from sex for a long time and enhance the relationship between husband and wife. In the mid-pregnancy coitus, we should pay attention to master a suitable frequency, in order to pregnant women feel comfortable. The husband’s movements should be gentle, not too violent, and avoid the wife’s abdomen is pressed, if the abdomen is pressed, it may lead to premature rupture of fetal membranes, which is likely to lead to the death of the fetus lack of oxygen. Intercourse in mid-pregnancy should also be based on their own situation to decide, some women have had a miscarriage and premature birth experience or a serious pregnancy syndrome, then try not to cohabit.