Intercourse during pregnancy is usually done in the lateral position. Because early and late pregnancy can not have intercourse, it will lead to preterm miscarriage or preterm labor. Only in the middle of pregnancy can moderate intercourse, this time the belly has been very large, if in the male on female position, prone to contractions or the risk of premature rupture of fetal membranes. So it is recommended that in the middle of pregnancy, you can take the side lying position or from back to front. Pay attention to controlling your emotions during intercourse. The frequency of intercourse per week must be reduced and the magnitude must be controlled to avoid inducing contractions when you are too emotionally stressed, which may cause preterm abortion. If you have vaginitis, do not have intercourse to avoid infection. Pay attention to hygiene and wash in time before and after intercourse.