How long can sperm survive in a woman’s body? This time can be very important for the conception of a small life, enough time for the sperm to have a chance to meet the egg. This article will give you detailed answers to the question of how long sperm survive in the female body. 1, sperm retention time in the female reproductive tract The vaginal acidic secretion is usually pH 3.5-4. Although in theory, as long as there is a live sperm can be fertilized, but in practice, under the acidic environment of the vagina, most of the sperm enter the vagina not long before they die out, and only with a certain amount of semen buffer, it is possible for a very small number of sperm with high vitality to survive for a longer period of time, gain access to the uterus and fertilization. Without the sacrifice of a large number of sperm, it is impossible for a single sperm or a very small number of sperm to survive and be fertilized in the acidic environment of the vagina without a certain amount of semen buffering to improve the acidic and alkaline environment of the vagina. In general, the survival time of sperm in the vagina is: 2 hours after intercourse, 90% die; 36 hours, even the dead ones are invisible. In the vagina of pregnant women, the stronger the acidity the faster the sperm die. 2. The survival time of sperm at the cervix The change of pH of cervical mucus has a great influence on the penetration of sperm. pH less than 6.5, sperm stop moving, pH 7, there is a mild penetration ability, pH 7.5, the penetration ability is normal, pH 8. 2, the penetration ability is stronger. There is much mucus obstruction at the ectocervix, causing many sperm to fail to penetrate and die on the outside. The cervical mucus is thick and tough just after menstruation; near the time of ovulation, the mucus becomes more, clearer and more twitchy due to the increase of estrogen in the blood; at the time of ovulation, the amount of mucus is more, clearer and outflowing, and sperm can easily penetrate. Sperm penetration of cervical mucus is dependent on the hydrolysis of enzymes. Trypsin, chymotrypsin and hyaluronidase can hydrolyze cervical mucus, reduce viscosity, and lose the formation of sticky filaments, while facilitating the passage of sperm. In general, the survival time of sperm at the cervix is: in the cervix, 15 minutes after intercourse, sperm can be found in the cervical mucus; one hour later, sperm enter the inner mouth; in the uterine cavity, one hour after intercourse there are sperm in the uterine cavity, six hours later, all active sperm, 12 hours later 5/6 of the sperm are still alive, 36 hours later 1/4 of the sperm are still alive, after three days, there is no live After three days, there are no live ones. After three days, there are no live sperm. However, sometimes there are individual sperm that survive for a particularly long time. In the fallopian tube, there are active sperm after 14 hours of intercourse, and sometimes there are still live sperm after 35 days, usually the most active ones are 14 days old, and some enter the abdominal cavity. Those with sluggish motility are pushed back into the uterine cavity by the cilia flow.