SexHealthMatters.org is the website of the Sexual Medicine Society of North America, Inc.

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How much semen is produced at ejaculation?

The average man produces 1.5-5 ccs (one quarter to a full teaspoon-full) of semen at ejaculation. Usually, the amount is less than a teaspoon, but it can be larger is a man hasn’t ejaculated in awhile.

Semen is composed of many different substances, including many of the body’s chemicals. Even the breakdown of food products makes its way into semen. Sometimes, the food a man eats can affect his semen. For example, asparagus drastically changes the odor of semen.

Medicines, herbal supplements, caffeine, and alcohol can also change the properties of semen, most notably sperm count.

We usually associate semen with sperm, but sperm only makes up about 5% - 10% of seminal fluid. Still, the amount of sperm cells in the average ejaculation of a healthy man can be 40 million or more!

Most sperm cells have a head and tail, but sometimes they can have two heads, two tails, an oval head instead of a round one, or a small head. The amount of abnormal sperm can be one factor in male infertility.

Fructose, a type of sugar, is also found in semen. Fructose gives the sperm cells the energy to swim to their destination.

The fluid portion of semen is produced by the prostate, seminal vesicle, and other sex glands. Sperm comes from the testicles.