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Does testosterone cause erections?

Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Let me clear up the first misconception about erections: It's not testosterone that's the main driver of erection, though it does play a role. The reality is that erections happen because of many things going on in the body at once.

The major way that the penis gets hard isn't through X-rated Internet sites, it's through receptors on cells lining our arteries that stimulate a chain reaction that ultimately relaxes the blood vessels that go to the penis. That reaction is mediated by nitric oxide, that short-lived gas floating around in your body.

Nitric oxide is usually made by the endothelial cells that line all of our arteries. As soon as even a small amount of hardening of the walls starts with the creation of mild plaque, levels of nitric oxide plummet, so the vessel cannot dilate normally when you need a little extra blood, as when running for the bus or rummaging around in bed.
You: Staying Young: The Owner's Manual for Extending Your Warranty

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You: Staying Young: The Owner's Manual for Extending Your Warranty

International bestselling authors of YOU: The Owner's Manual and YOU: On a Diet give you all the tools and know-how to stay young and defy the ageing process. Drawing lively parallels between your...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.