Mid-pregnancy coitus, the position used is still the female position, but pay attention to the sexual life of the action must be gentle, can not be too rough. If too rough sex, often stimulate the uterus to cause contractions, will cause the placenta and the uterine wall between the stripping, resulting in placental abruption, threatening pregnant women as well as the life of the fetus, will cause very serious consequences, so in the mid-pregnancy coitus action must be gentle. In addition, the frequency of coitus should not be too frequent, too frequent sex to make the uterus contraction, which will lead to the fetus in the uterus in the state of oxygen deficiency. If you have sex too often, the fetus often lack of oxygen, may lead to slow growth or serious fetal death in the womb, so this point should be paid special attention to.