Why Is Sexual Intercourse Prohibited in the Late Stages of Pregnancy?

Generally, sexual intercourse is discouraged during the third trimester of pregnancy primarily to avoid risks such as preterm premature rupture of membranes (PPROM), induction of preterm labor, intrauterine infection, uterine bleeding, and exacerbation of physical discomfort. If any abnormal symptoms arise during pregnancy, prompt antenatal evaluation and management at a reputable hospital are essential. A detailed analysis follows:

1. Preterm Premature Rupture of Membranes (PPROM)

During late pregnancy, the fetus grows larger, increasing intra-amniotic pressure continuously. Physical impact from sexual activity may directly compress the abdomen and stretch intrauterine tissues, leading to membrane rupture and leakage of amniotic fluid—disrupting the fetus’s normal intrauterine environment.

2. Induction of Preterm Labor

In late pregnancy, uterine sensitivity increases significantly; external stimuli can trigger frequent uterine contractions. Regular and repetitive contractions promote cervical dilation and prematurely initiate the labor process, resulting in preterm birth. Preterm infants often have underdeveloped organs and reduced immune resistance.

3. Intrauterine Infection

During late pregnancy, the cervical canal shortens progressively and the cervical os begins to dilate slightly, weakening the body’s natural defense barrier. Sexual intercourse may introduce external bacteria into the genital tract; once bacteria invade the uterine cavity, they can contaminate amniotic fluid and infect the placenta, endangering both maternal and fetal health.

4. Uterine Bleeding

The uterus in late pregnancy has abundant yet fragile blood vessels. External stimulation may cause capillary rupture in the endometrium, resulting in minor vaginal bleeding. Severe bleeding may compromise placental perfusion and impair normal fetal development.

5. Exacerbation of Physical Discomfort

Most women experience low back pain, abdominal discomfort, lower-limb edema, chest tightness, and fatigue during late pregnancy. Sexual activity consumes energy, intensifies physical exhaustion, and increases abdominal pressure—thereby worsening existing pregnancy-related discomforts.

During late pregnancy, maintain genital hygiene and dryness, prioritize bed rest, and avoid strenuous exercise or abdominal pressure. Attend routine antenatal visits regularly, closely monitor fetal movements and bodily changes, and seek immediate medical attention if symptoms such as abdominal pain, fluid leakage, or vaginal bleeding occur.