It is not recommended that couples have intercourse during pregnancy, especially in the first and second trimesters of pregnancy, to avoid adverse effects on the pregnant woman herself and the fetus. The reasons for not recommending intercourse in early pregnancy and late pregnancy are as follows: 1. Early pregnancy: early pregnancy, that is, before 12 weeks, because women are affected by endocrine and early pregnancy reaction, coupled with the safety of the fetus in the womb, should reduce the requirements and frequency of intercourse. And at this time, the uterus is sensitive, the placenta is not yet mature, the placenta is not closely connected to the uterine wall, followed by insufficient secretion of progesterone to prevent miscarriage, can not give strong protection to the fetus, intercourse may lead to pre-eclampsia or even miscarriage; 2, late pregnancy: at this time, due to the rapid growth of the uterus resulting in the decline of the amniotic sac, intercourse is likely to cause premature rupture of the fetal membrane, thus inducing infection, umbilical cord prolapse and preterm delivery, fetal The first thing you need to do is to avoid intercourse. Although coitus is not recommended in early and late pregnancy, sexual intercourse can be appropriate in the middle of pregnancy to meet the normal physiological needs of the couple. Because the placenta has been formed during this period, the fetal condition is more stable, so proper intercourse will not cause more serious effects. But be sure to pay attention to gentle movements, and at the same time pay attention to rest, strengthen nutrition, avoid strain.