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How does testosterone affect a man's sex drive?

While testosterone isn't only about your sex drive, it's a big part of the equation. Testosterone prompts the growth of genitals at puberty and drives reproduction, says Robert Brannigan, a urologist at Northwestern Memorial Hospital and associate professor of urology at Northwestern University Feinberg School of Medicine. Without it your penis can't operate and your testicles can't produce sperm. Low testosterone causes erectile dysfunction, in part, by dampening lusty thoughts and the desire to put them into action. If you have low testosterone, sex holds as much appeal as mowing the lawn.

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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.