After the pregnancy sex life hazards are the following aspects: first, easy to cause female infection, after the pregnancy of women’s immunity decreased, the body is in a state of stress, at this time vulnerable to bacterial, viral infection. Second, easy to cause adverse effects on the fetus, the fetus and the mother’s relationship is extremely close, so once the mother is harmed or infected, the fetus is also susceptible to infection, which may cause deformities in the development and growth of the fetus. Third, there will be the possibility of miscarriage, if the pregnancy is longer still have sex, the fetus is likely to miscarry due to excessive pressure, with serious consequences. Fourth, will produce psychological pressure on pregnant women, more likely to lead to excessive psychological pressure on pregnant women, the negative impact on the emotions, may lead to insomnia, anxiety, depression and even cause emotional disorders. Fifth, it will have a negative impact on the next pregnancy and affect the next fertilization.