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What role does testosterone have in regulating an erection?

Testosterone is not directly involved in erections, but low levels of the male hormone can diminish a man’s desire for sex, contribute to feeling sluggish and tired and cause erectile dysfunction (ED). Low testosterone levels may be caused by another health condition that makes it difficult for a man to get or maintain an erection, such as depression, diabetes, elevated cholesterol and high blood pressure.
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Testosterone is a sex hormone that is secreted by the testicles, and it plays a key role in both wanting to have sex, and in the ability to have frequent erections. Most men have enough testosterone circulating in their bloodstream. Most cases of erectile dysfunction are caused not by low testosterone levels, but by circulatory problems caused by often undiagnosed heart disease or diabetes. 
Mark Moyad
Urology
Many things can affect erections other than testosterone levels, and there are plenty of men with low testosterone who can still have good erections. However, in some instances, reduced sex drive or penile hardness could be partially due to a low testosterone level. Generally speaking, testosterone replacement therapy (TRT) is not indicated just because a man has a low testosterone level. It may be recommended for a specific person because multiple symptoms of aging are caused by a low testosterone level, and getting TRT would have more benefits as compared to risks. Research is showing that there are a lot of men with low testosterone who function just fine in the bedroom and in other aspects of life.
Dr. Moyad's Guide to Male Sexual Health: What Works and What's Worthless

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Dr. Moyad's Guide to Male Sexual Health: What Works and What's Worthless

There is perhaps no medical topic that is discussed less than male sexual health. True that it is the basis of countless tasteless jokes, but seldom is the subject approached in a frank and...

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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.