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What is ejaculation?

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When you're sexually aroused, tubes called the vas deferens squeeze sperm from the testes toward the back of the urethra, the tube where semen and urine flow through. The seminal vesicles also release fluid there.

The urethra senses the sperm and fluid mixture. Then, at the height of sexual excitement, it sends signals to your spinal cord, which in turn sends signals to the muscles at the base of your penis. These contract powerfully and quickly, every 0.8 seconds. This ejaculates the semen out of the penis as you climax.

SOURCES:

National Institute of Diabetes and Digestive and Kidney Diseases.

Cleveland Clinic.

Reviewed by Melinda Ratini on November 15, 2017

SOURCES:

National Institute of Diabetes and Digestive and Kidney Diseases.

Cleveland Clinic.

Reviewed by Melinda Ratini on November 15, 2017

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