All glands are little chemical factories that produce complex substances you need for various purposes throughout your body. Curiously, medical science has yet to understand fully the prostate's function. It produces some but not all of the cloudy white fluid known as semen or ejaculate, probably its principal activity. Semen is the fluid medium that transports sperm cells, the male contribution to human reproduction. The prostate may have several other functions.
Some researchers speculate the prostate produces important enzymes or other chemicals.
The exit ducts from the prostate lead directly into the urethra, the passage inside the penis through which semen exits the body, so the function of these chemicals should be limited to processes within the prostate or possibly reproduction. In the latter case, substances from the prostate may stimulate activity of sperm, thereby enhancing female impregnation. The prostate undergoes mechanical contractions during ejaculation that may also facilitate sperm movement. In their early stages of development, male and female fetuses are essentially the same physically. When the male hormone testosterone appears in the male fetus, the prostate begins to grow.