Does testosterone increase sex drive? The relationship explained

Sex drive is influenced by many factors, but testosterone is one of the most important. The hormone appears to impact parts of the brain involved in sexual motivation and arousal, and it may support erectile function through its effects on blood flow.

But when it comes to testosterone replacement therapy (TRT) and sex drive, the relationship is more nuanced. Read on to find out how testosterone influences libido, how TRT may affect sex drive, and how to tell if low testosterone is contributing to low sex drive.

Yes, testosterone increases sex drive. The hormone impacts various brain regions involved in sexual motivation and arousal, including the hypothalamus.Research also suggests a link between low testosterone and low libido. As part of the Massachusetts Male Aging Study (MMAS), a landmark study on aging and men's sexual health, researchers assessed sexual desire in over 1,500 men and measured their testosterone levels. Those who reported lower sexual desire had an increased risk of low T.

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Testosterone appears to influence sex drive through a number of pathways, beginning in the brain. 

Androgen receptors — proteins that allow cells to respond to testosterone — are found throughout the brain, including the temporal lobe, hypothalamus, and prefrontal cortex. Research suggests that areas such as the mediobasal hypothalamus and limbic system are the regions most involved in sexual desire, and they also contain high amounts of androgen receptors.

An androgen receptor functions like a hormone-activated switch. When testosterone binds to these receptors, it influences the brain circuits involved in sexual motivation and arousal. Research has also found that testosterone levels are associated with increased blood flow in several brain regions during sexual arousal.

But testosterone's effects are not limited to the brain. The hormone also helps regulate nitric oxide production and other pathways involved in libido and sexual function. While sexual arousal may begin in the brain, it also relies on physical processes throughout the body that testosterone helps support.

Low testosterone or low T, also known as hypogonadism, is an abnormally low level of testosterone in the blood, usually defined as less than 300 ng/dL (nanograms per deciliter). Normal testosterone levels are typically between 300 ng/dL and 1,000 ng/dL, depending on the source.

Low testosterone levels are just one part of the diagnosis of low T. Symptoms and signs of low testosterone also play a role, and some healthcare providers may recommend treatment even if T levels are slightly above 300 ng/dL when symptoms and signs are typical of low T.

Testosterone levels naturally decline with age. The decrease usually begins in a man’s 30s and continues to drop about 1% each year. 

Because testosterone affects many bodily systems, low levels may cause a range of symptoms, including fatigue, loss of muscle mass, increased body fat, and anemia (low red blood cell count).

Related to sexual health, low testosterone may contribute to:

• Low libido

• Erectile dysfunction 

• Loss of morning erections 

• Reduced sperm count

• Infertility

A healthcare provider can measure testosterone levels with a blood test. T levels are usually highest in the morning and vary throughout the day. To diagnose low T, a healthcare provider may require two early-morning tests (usually between 8 a.m. and 10 a.m.) on different days to confirm levels below 300 ng/dL.

When testosterone levels are normal and other signs and symptoms of low T are absent, it may be worth exploring other possible causes of low sex drive, such as depression, anxiety, medication side effects, or underlying health conditions.

Testosterone replacement therapy (TRT) is a treatment approved by the US Food and Drug Administration (FDA)for men who have low testosterone due to certain medical conditions, such as problems with the testes, pituitary gland, or hypothalamus. In essence, TRT supplements the testosterone the body is not producing enough.

While research suggests that TRT may improve libido in men with low testosterone levels at baseline, it appears to have no additional benefit once testosterone levels are normalized. In other words, TRT is unlikely to make a meaningful difference in sex drive when testosterone levels are already within the normal range.

Testosterone therapy can be administered in several ways, including:

• Skin patches

• Gels

• Injections

• Surgically implanted pellets

• Tablets

Many men who experience low testosterone may find relief with testosterone replacement therapy. However, not everyone is a candidate for TRT, and other treatments are available, such as clomiphene, a drug that can be used off-label to treat low T in men. A healthcare provider can help develop a safe treatment plan for low T.

Side effects of TRT

A common side effect of testosterone replacement therapy is low sperm count. testosterone from TRT can cause your body to slow the production of sex hormones because it thinks you're making enough. This may slow sperm production and worsen your body's ability to make its own testosterone. Recovery after stopping TRT can take time and varies from person to person.

Other side effects of TRT may include acne, enlarged prostate, enlarged breasts, lower fertility, and worsening sleep apnea.

Anyone experiencing a chronically low sex drive or reduced sexual function should consider speaking with a healthcare provider, who can perform a blood test, evaluate for other conditions that may be contributing to these symptoms, and, if appropriate, recommend a suitable treatment plan.

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Testosterone is one of the key hormones driving libido, so when T levels decline, men may notice a reduction in overall sexual desire. Those noticing changes in sex drive may benefit from having their testosterone levels tested.

• Testosterone plays a key role in regulating sex drive. Research suggests that low testosterone is associated with reduced libido, and the hormone appears to influence brain pathways involved in sexual motivation and arousal.

• Low testosterone may impact various aspects of sexual function. Along with low libido, low T may contribute to erectile dysfunction, loss of morning erections, and reduced sperm count.

• For those experiencing low libido, a healthcare provider may recommend testosterone testing, especially if other symptoms of low T are present. To diagnose low T, a healthcare provider may require two early-morning blood tests on different days confirming levels below 300 ng/dL.

• Testosterone replacement therapy may increase libido in men with low testosterone. For those with normal testosterone levels, however, TRT is unlikely to make a meaningful difference.