Intercourse in the second trimester is risky and needs to be avoided. The development of the embryo in the first trimester of pregnancy is still unstable, and it is easy to have the problem of preterm miscarriage, especially coitus will lead to an increased risk of preterm miscarriage. In order to avoid the occurrence of preeclampsia, pregnant women should try not to have intercourse in the first trimester of pregnancy, and also not to have intercourse in the late stages of pregnancy to avoid the problem of preterm labor. If the development of the embryo is stable after the third trimester, you can have intercourse appropriately in the middle of pregnancy, but not too frequently. In addition, if the pregnant woman’s physical condition is weak, the embryo has been developing unstably, then it is best not to have intercourse and strenuous exercise during the entire pregnancy, and at the same time to go to the hospital regularly for obstetrics, and actively cooperate with the doctor to protect the fetus. It is recommended to follow the doctor’s advice on whether or not to have intercourse during pregnancy.