Anne Truong MDMen's Sexual Health Doctor

The Muscles That Keep Blood in Your Erection #menshealth #ED

27 Jul 2026 · 1 min

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In this short educational segment, Dr. Anne Truong explains the anatomy and function of two key pelvic floor muscles—the bulbospongiosus and the ischiocavernosus—and how they contribute to both ejaculation and maintaining an erection. She describes how these muscles contract to expel semen and simultaneously act like a tourniquet or rubber band, trapping blood within the penis to sustain rigidity. The explanation includes visual references to the muscles’ positions at the base of the penis and along the shaft, and connects their function to pelvic floor health, noting that Kegel exercises target these muscles to improve erectile performance and overall sexual health.

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Their function is to expel the semen. They function for the contraction that you have, and then they also function as keeping the blood in the penis while you are erect. So it acts like a tourniquet that keeps the blood in there. You see the bulbospongiosus muscle here? It kind of wrap at the base of the penis and the ischiocavernosus muscle wrap at the base of the penis and also go down the shaft of the penis as well. So it function as almost like a rubber band that prevent blood from going back to the body. But the blood stays in the pussy. So those muscles are pelvic muscles and Kegels are the exerciser muscles.