The increase of estrogen and progesterone in the body after pregnancy will lead to an increase in the sensitivity of the pubic area and a gradual increase in sexual desire, which is a normal physiological phenomenon. However, during pregnancy, sexual intercourse should be avoided in the first 3 months and the second 3 months. Because the combination of the placenta and the uterine lining is not strong in the first three months of pregnancy, strenuous exercise and sex will cause the uterus to be stimulated by strong contractions, leading to endometrial detachment, bleeding, and then lead to miscarriage or miscarriage of the first trimester. Moreover, coitus at this stage is prone to intrauterine infections, inducing cervicitis, causing cervical relaxation, and in severe cases, may also lead to placental abruption. After three months of pregnancy, the fetus is still growing, the uterus is also growing, if this time, easy to cause premature rupture of membranes, may lead to premature birth, may also make the bacteria through the vagina into the uterus, triggering intrauterine infections, affecting the growth and development of the fetus, and in serious cases, may even jeopardize the mother’s and children’s life safety. The growth of the fetus is more stable in the middle of pregnancy, you can have a proper sex life, but you need to pay attention to the frequency and intensity of coitus, to avoid excessive intensity or stimulation to produce adverse consequences. However, if placenta praevia occurs in mid-pregnancy, you should also avoid sex.