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Men should be masturbating more if they want to reduce their risk of developing cancer, according to the NHS.

Research published on the NHS website found the risk of prostate cancer was significantly lower in men who ejaculated at least 21 times a month through sex or masturbation.

Prostate cancer is the most common cancer in men in the UK, with more than 40,000 new cases every year.

Researchers from Harvard and Boston medical schools and universities studied 31,925 healthy men who completed a questionnaire about their ejaculation frequency back in 1992, reports the Plymouth Herald .

The men, who were aged 20-to-29 and 40-to-49, were monitored until 2010 and during that time 3,839 of them were diagnosed with prostate cancer.

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The findings, published in the journal European Urology , compare the 21-timers with men who ejaculate just four-to-seven times every four weeks.

The researchers found that the risk of prostate cancer in men in those age groups was significantly reduced if they ejaculated at least 21 times a month.

This was compared with men who ejaculated just four-to-seven times a month.

However, the researchers are not speculating on the reasons why ejaculating reduces the risk of prostate cancer.

It is being reported that previous research hints at the possibility that ejaculation contributes to getting rid of cancer-causing elements and infections from the gland.

Inflammation is a known cause of cancer, and ejaculation may help to ease this.

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They wrote: "We found that men reporting higher compared to lower ejaculatory frequency in adulthood were less likely to be subsequently diagnosed with prostate cancer."

The study has been featured on the NHS website, which notes a range of other factors - such as genetics, lifestyle, number of children, diet, nature of sexual activity and education - may also contribute to prostate cancer risk.

However the NHS website also says: "Despite any lurid tales you may have heard growing up, masturbation is entirely safe.

"So if you want to do it as a preventative method, then it wouldn't pose any health risks."

Initial signs of prostate cancer usually involve problems with urination, such as needing to urinate more frequently, due to the prostate getting larger. While prostate enlargement can occur as men grow older, it is important to check symptoms like these with your GP.

Prostate cancer facts

From the NHS website

Prostate cancer is the most common cancer in men in the UK, with over 40,000 new cases diagnosed every year.

It usually develops slowly, so there may be no signs you have it for many years.

Symptoms often only become apparent when the prostate is large enough to affect the urethra (the tube that carries urine from the bladder to the penis).When this happens, men may notice things like an increased need to urinate, straining while urinating and a feeling that your bladder has not fully emptied.T

These symptoms shouldn't be ignored, but they do not mean you definitely have prostate cancer. It is more likely that they are caused by something else, such as benign prostatic hyperplasia (also known as BPH or prostate enlargement).

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What is the prostate?

The prostate is a small gland in the pelvis found only in men. About the size of a satsuma, it's located between the penis and the bladder and surrounds the urethra.

The main function of the prostate is to help in the production of semen. It produces a thick white fluid that is mixed with the sperm produced by the testicles, to create semen.

Why does prostate cancer happen?

The causes of prostate cancer are largely unknown. However, certain things can increase your risk of developing the condition.

The chances of developing prostate cancer increase as you get older. Most cases develop in men aged 50 or older.

For reasons not yet understood, prostate cancer is more common in men of African-Caribbean or African descent, and less common in men of Asian descent.

Men who have first degree male relatives (such as a father or brother) affected by prostate cancer are also at slightly increased risk.

Tests for prostate cancer

There is no single test for prostate cancer. All the tests used to help diagnose the condition have benefits and risks, which your doctor should discuss with you.

The most commonly used tests for prostate cancer are blood tests, a physical examination of your prostate (known as a digital rectal examination or DRE) and a biopsy.

The blood test, known as a prostate-specific antigen (PSA) test, measures the level of PSA and may help detect early prostate cancer. Men are not routinely offered PSA tests to screen for prostate cancer, as results can be unreliable.

This is because the PSA blood test is not specific to prostate cancer. PSA can be raised due to a large non-cancerous growth of the prostate (BPH), a urinary tract infection or inflammation of the prostate, as well as prostate cancer. Raised PSA levels also cannot tell a doctor whether a man has life-threatening prostate cancer or not. This means a raised PSA can lead to unnecessary tests and treatment.

However, you can ask to be tested for prostate cancer once the benefits and risks have been explained to you.

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How is prostate cancer treated?

For many men with prostate cancer, treatment is not immediately necessary.

If the cancer is at an early stage and not causing symptoms, a policy of "watchful waiting" or "active surveillance" may be adopted. This involves carefully monitoring your condition.

Some cases of prostate cancer can be cured if treated in the early stages. Treatments include surgically removing the prostate,radiotherapy and hormone therapy.

Some cases are only diagnosed at a later stage when the cancer has spread. If the cancer spreads to other parts of the body, typically the bones, it cannot be cured and treatment is focused on prolonging life and relieving symptoms.

All treatment options carry the risk of significant side effects, includingerectile dysfunction and urinary incontinence. For this reason, many men choose to delay treatment until there is a risk the cancer might spread.

Newer treatments, such as high-intensity focused ultrasound (HIFU) or cryotherapy, aim to reduce these side effects. Some hospitals may offer them as an alternative to surgery, radiotherapy or hormone therapy. However, the long-term effectiveness of these treatments are not yet known.

Read more about treating prostate cancer.

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Living with prostate cancer

As prostate cancer usually progresses very slowly, you can live for decades without symptoms or needing treatment.

Nevertheless, it can have an effect on your life. As well as causing physical problems such as erectile dysfunction and urinary incontinence, a diagnosis of prostate cancer can understandably make you feel anxious or depressed.

You may find it beneficial to talk about the condition with your family, friends, a family doctor and other men with prostate cancer.

Financial support is also available if prostate cancer reduces your ability to work.