If the pregnant woman and the fetus are not abnormal, you can moderately have sex, but try not to have intercourse in the early and late pregnancy. Sex during pregnancy is related to miscarriage and premature birth, but it is not a direct cause of miscarriage and premature birth, but only a precipitating factor, and the chance of miscarriage caused by moderate sex life is very small. On the contrary, choose the right position, pay attention to matters related to also help pregnant women to maintain a relaxed state of mind, to reduce the discomfort during pregnancy, to enhance the relationship between the couple. Sex during pregnancy should be moderate, specifically to control the number of intercourse, each intercourse time to be short, shallow penetration site, the action should be light, the specific to control to which extent, there is no definite, to the comfort of pregnant women prevail. Secondly, before and after intercourse should pay attention to hygiene, both sides wash their hands and external genitalia to reduce the risk of infection. In addition, special attention should be paid to avoid blowing during oral sex, because the air entering the vagina may cause air embolism if it accidentally enters the blood vessels, and in serious cases, pulmonary embolism occurs in pregnant women, which is very dangerous. However, it is recommended to strictly avoid sexual intercourse if the following conditions exist in pregnant women Such as unexplained vaginal bleeding, previous history of miscarriage or preterm delivery, current risk of miscarriage or preterm delivery, low placental status or placenta praevia, cervical insufficiency, hypertension during pregnancy, twin or multiple pregnancies, history of cesarean section or myomectomy, inflammation of the reproductive tract in both partners, etc. In conclusion, if the indicators of pregnant women and fetus are normal during pregnancy, sex can be moderate, but orgasm should be avoided as much as possible while choosing in vitro ejaculation, especially in early and late pregnancy, because nipple stimulation, orgasm and prostaglandins in semen can cause uterine contractions, which are generally mild and may induce miscarriage or preterm delivery in severe cases.