When It's Not Safe
Two types of sexual behavior aren't safe for any pregnant woman:
1.If you engage in oral sex, your partner should not blow air into your vagina. Blowing air can cause an air embolism (a blockage of a blood vessel by an air bubble), which can be potentially fatal for mother and child.
2.You should not have sex with a partner whose sexual history is unknown
to you or who may have a sexually transmitted disease (STD), such as herpes, genital warts, chlamydia, or HIV. If you become infected, the disease may be transmitted to your baby, with potentially dangerous consequences
If significant complications with your pregnancy are anticipated or detected by your health care provider, he or she is likely to advise against sexual intercourse. Common risk factors include:
•a history or threat of miscarriage
•a history of pre-term labor (you've previously delivered a baby before 37 weeks) or signs indicating the risk of pre-term labor (such as premature uterine contractions)
•unexplained vaginal bleeding, discharge, or cramping
•leakage of amniotic fluid (the fluid that surrounds the baby)
•placenta previa, a condition in which the placenta (the blood-rich structure that nourishes the baby) is down so low that it covers the cervix (the opening of the uterus)
•incompetent cervix, a condition in which the cervix is weakened and dilates (opens) prematurely, raising the risk for miscarriage or premature delivery
•multiple fetuses (twins, triplets, etc.)
Per Jacobs comment: Some doctors recommend that all women stop having sex during the final weeks of pregnancy, just as a safety precaution, because semen contains a chemical that may actually stimulate contractions'