How long does sperm survive after sex?

After intercourse, sperm can survive for about 24 hours, but the physical condition of each male friend is different, so the sperm survival time will also be different. Some male friends' sperm survival time is relatively short, and the survival rate is not very high, which is relatively low. This situation shows that there is an abnormality in the sperm and the sperm motility becomes very low, which causes various diseases.

Sperm survival rate refers to the proportion of live sperm in a drop of semen. Normal sperm survival rate is >85-90%, can move in a certain direction, climb 5cm high, and abnormal sperm is <20%.

Male fertility is directly proportional to the number of sperm and sperm motility, and inversely proportional to the number of abnormal sperm. If the semen test results show that the semen volume is less than 2ml, the sperm count is less than 60 million/ml, or the normal sperm morphology is less than 60%, the sperm survival rate is less than 60%, and the sperm motility is below II, it will have a direct impact on fertility.

(1) Sexual intercourse:

Sexual intercourse can reflexively cause the contraction of the vagina and uterus, accelerating the movement of sperm. Sex medicine research has confirmed that the vagina contracts rhythmically during female orgasm, and the uterus is also in a contracted state. Animal experiments have shown that repeated mating stimulation can greatly accelerate the movement of sperm and increase fertilization rates.

(2) Estrogen:

Estrogen can enhance the contraction of the fallopian tube. In the preovulation and ovulation period, when estrogen is dominant, the secretion of the fallopian tube increases, and the fallopian tube moves from the proximal end to the distal end in segments, pushing the sperm and fallopian tube fluid step by step from the uterus to the ovary. Sex hormones can also affect the movement of sperm by affecting the properties of the cervix and fluid.

(3) Prostaglandins:

There are many kinds of prostaglandins in semen and the female reproductive tract, which have a contraction effect on the non-pregnant uterus and fallopian tubes. In addition, estrogen can enhance this effect. The sensitivity of the uterus to prostaglandins is higher in the middle of the menstrual cycle.

(4) Cervical mucus:

Cervical mucus serves as a sperm storage area, protecting sperm from the adverse vaginal environment, providing energy for sperm, and may be involved in sperm capacitation.

(5) Impact on spermatogenesis. The reason why men have sperm is that they rely on a certain spermatogenesis system to control it. If any part of the male spermatogenesis system is abnormal, it will cause male spermatogenesis dysfunction, resulting in a low sperm survival rate.