What Your Semen Says About Your Health

Table of Contents
View All
Table of Contents

Semen is the cloudy white bodily fluid that is emitted from the urethra and out of the penis during ejaculation. It consists of motile sperm cells (called spermatozoa) and a nutrient-rich fluid called seminal fluid. The purpose of the seminal fluid is to both transport the sperm cells and enhance their fertilization abilities.

Here are some answers to common questions about semen.

How Is Sperm Produced?

Sperm cells are produced in the testicles. From there they enter the epididymis where they mature. Sperm are also stored in the epididymis before they make their way up a long open tube called the vas deferens. The tip of the vas deferens connects with the ejaculatory ducts where it combines with the rest of the fluid that makes the semen or "ejaculate."

Sperm production to ejaculation
Verywell / JR Bee

Cowper's Glands

The first portion of seminal fluid (about 5%) consists of secretions from the Cowper's glands. These pea-sized glands produce what is called the pre-ejaculate fluid, the small amount of fluid that is released before ejaculation. This fluid lubricates the urethra and neutralizes any acidity, allowing the sperm to travel easily.

Prostate Gland

Around 15% to 30% of semen is produced by the prostate gland, a walnut-sized gland located at the base of the bladder surrounding a man's urethra. The prostate gland is the primary source of acid phosphatase, citric acid, inositol, calcium, zinc, and magnesium.

All of these unique components play a role. For example, zinc is believed to be an antibacterial factor. Interestingly, some experts believe that this may contribute to the reason why urinary tract infections are not as common in men compared to women.

The prostate gland also releases enzymes that work to liquefy semen about 15 to 30 minutes after ejaculation. This liquefying process allows the sperm to be slowly released.

The sperm cells can then enter the cervix and travel upstream in the female reproductive system in an orderly fashion, with the ultimate goal of finding an egg to fertilize. 

Seminal Vesicles (Seminal Glands)

Around 65% to 75% of seminal fluid is produced by the seminal vesicles, which are located above the prostate gland at the base of the bladder. They contribute components like fructose (a sugar) and prostaglandins.

Fructose nourishes the sperm cells, providing them with energy. Prostaglandins help trigger the contraction of vaginal muscles in order to propel the sperm up the vaginal canal and through the cervix.

Clotting factors are also present in the fluid secreted by the seminal vesicles. This makes the semen clump together, forming a jelly-like consistency right after ejaculation.

The purpose of the clotting process is to hold the sperm in place until it can be slowly released during the liquefying process (controlled by enzymes secreted by the prostate gland).

What Is the Smell and Taste of Semen?

Semen often has a chlorine-like smell and tastes slightly sweet due to its high content of fructose. That being said, the taste of semen tends to change slightly from person to person.

If your semen is foul-smelling, see your healthcare provider as this is often a sign of infection.

What Is the Volume Ejaculated?

The volume of semen that is released during ejaculation varies among research studies, although a review study in the Journal of Andrology suggests that the average volume is around 3.4 ml. Also, two factors that may affect semen volume during ejaculation include the last time you ejaculated and hydration status.

What Does Semen Color Indicate?

Normal semen may have an off-white or slightly yellow tint.

Red or Brown Semen

If your semen has a red or brown appearance, it can be a sign of blood. While this may seem alarming to you, in most instances, blood in your semen (called hematospermia) is usually benign.

The most common reason for it is from a prostate biopsy, but it can also be due to a variety of other conditions that affect the organs of the male reproductive tract like an infection. Rarely, blood in the semen is a sign of cancer.

The good news is that hematospermia generally resolves on its own. However, it's important to get it checked out by your healthcare provider. He will likely ask you questions, perform an examination (especially of the scrotum and prostate gland), and do a

Yellow or Green Semen

Semen with a pronounced yellow or green color may indicate an infection like the sexually transmitted infection (STI) gonorrhea. If your semen is discolored due to a gonorrhea infection (it may also have a foul smell), treatment with antibiotics prescribed by a healthcare provider will be necessary.

A Word From Verywell

Your semen is not as simple as you may have thought. It has lots of components to it, all of which play a role in enhancing reproduction—your sperm reaching an ovulated egg.

However, it's important to note that the fluid part is not absolutely critical for fertilization, as evidenced by intracytoplasmic sperm injection in which a single sperm is injected into an egg. 

Of course, if you have any questions or concerns about your semen, please contact your healthcare provider — and don't be embarrassed, this is what they are trained to do. 

Frequently Asked Questions

  • How does food intake affect semen?

    Diet can actually impact sperm quality and therefore fertility. Studies have shown that diets high in processed meats, trans fat, soy, high-fat dairy, and foods containing pesticides lower sperm quality, including its shape, quantity, and motility. The good news is that diets high in fish, fruits and vegetables, and walnuts are shown to increase sperm quality.

  • How long does it take to produce sperm?

    The average lifecycle of sperm is 74 days. After the testes make the sperm, it takes time for them to fully mature. This process takes about 2.5 to 3 months.

Was this page helpful?
8 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Barrett T, Tanner J, Gill AB, Slough RA, Wason J, Gallagher FA. The longitudinal effect of ejaculation on seminal vesicle fluid volume and whole-prostate ADC as measured on prostate MRI. Eur Radiol. 2017;27(12):5236-5243. doi:10.1007/s00330-017-4905-x


  2. Stocks CJ, Phan MD, Achard MES, et al. Uropathogenic employs both evasion and resistance to subvert innate immune-mediated zinc toxicity for dissemination. Proc Natl Acad Sci USA. 2019;116(13):6341-6350. doi:10.1073/pnas.1820870116


  3. McKay AC, Sharma S. Anatomy, Abdomen and Pelvis, Seminal Vesicle. Treasure Island, FL: StatPearls Publishing; 2019.


  4. Owen DH, Katz DF. A review of the physical and chemical properties of human semen and the formulation of a semen simulant. J Androl. 2005;26(4):459-69. doi:10.2164/jandrol.04104


  5. Mathers MJ, Degener S, Sperling H, Roth S. Hematospermia-a Symptom With Many Possible Causes. Dtsch Arztebl Int. 2017;114(11):186-191. doi:10.3238/arztebl.2017.0186


  6. Centers for Disease Control and Prevention. STD Facts - Gonorrhea. Updated January 29, 2014.


  7. University of Chicago Medicine. Don't make the mistake of letting a diet kill sperm. December 10, 2018.

  8. Shady Grove Fertility. The lifecycle of sperm: sperm development. Updated June 11, 2021.

Additional Reading