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1.月经期。妇女月经期间,子宫内膜脱落、出血,子宫腔表面有伤口;另外,在经血的中和作用下,阴道的酸度降低,防御病菌的能力减弱。倘若在这个时期性交,不但会造成经血量增加,月经期延长,而且还会通过性交使细菌从阴道侵入子宫,引起子宫内膜炎、附件炎等内生殖器官的炎症。男子本身也容易导致泌尿系的感染。2.妊娠前后期。妊娠早期是胎儿形成的主要时期,在母体子宫内“立足未稳。”如果性交,很容易引起流产。同时,性交时子宫收缩,也会造成流产。尤其是已经发生过自然流产和先兆流产的孕妇更要禁止同房。妊娠期最后3个月,特别是临产前的一个月因临近分娩,若这时性交,很容易使羊水早破胎儿脐带或肢体便会顺势滑脱,将会导致因脐带受压而引起宫内窘迫,
Menstrual period Women during menstruation, endometrial shedding, bleeding, wound surface of the uterine cavity; In addition, menstrual blood and the role of the vagina to reduce the acidity, the ability to defend the bacteria weakened. If during this period of intercourse, not only will result in increased menstrual flow, menstrual period, but also through sexual intercourse to bacteria invade the uterus from the vagina, causing inflammation of the endometritis, annex inflammation and other genital organs. Men themselves also easily lead to urinary tract infections. 2 before and after pregnancy. Early pregnancy is the main period of fetal formation, in the mother’s womb “If you are having sex, it is easy to cause miscarriage.” At the same time, uterine contraction during intercourse, can also cause abortion. In particular, pregnant women who have already had spontaneous abortion and threatened abortion have more restrictions on intercourse. The last 3 months of pregnancy, especially one month before giving birth because of the near childbirth, if sexual intercourse at this time, it is easy to premature rupture of the amniotic fluid or umbilical cord limbs will slip, will lead to intrauterine distress caused by compression of the umbilical cord ,