Sperm can survive for a long time in the male reproductive tract, but once ejaculated, they can only live for about 24 to 48 hours at human body temperature
Semen is secreted during male sexual activity, consisting of fluid and sperm from the vas deferens (about 10%), fluid from the seminal vesicles (about 60%), fluid from the prostate gland (about 30%). ) and small amounts from other glands, especially the bulbar urethra. Thus, most of the semen is secreted from the seminal vesicles, they are secreted last and play the role of washing sperm from the ejaculatory duct and ureter.
The average pH of semen is about 7.5, in which prostate fluid is slightly alkaline, helping to neutralize the acidity of other components in semen. Prostate fluid gives semen a milky white colour, while vesicle mucus gives semen a homogeneous mucilage. In addition, the clotting enzyme in the prostate fluid converts fibrinogen from the seminal vesicles into fibrin masses that help keep semen in the deep areas of the vagina and cervix. This fibrin block after about 15 to 30 minutes will be broken down by the fibrinolysin formed from the pro-fibrinolysin in the prostate gland. During the first 5 minutes after ejaculation, the sperm is still in a low state of activity. But after the fibrin blocks are resolved, they become very mobile.
Although sperm can survive for a long time in the male reproductive tract, once ejaculated, they can only live for about 24 to 48 hours at human body temperature. At lower temperatures, they can last a few weeks, and of course, if stored below minus 100 degrees Celsius, they can even live up to years.