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Men could reduce their risk of developing prostate cancer through regular masturbation, researchers suggest.

They say cancer-causing chemicals could build up in the prostate if men do not ejaculate regularly.

And they say sexual intercourse may not have the same protective effect because of the possibility of contracting a sexually transmitted infection, which could increase men's cancer risk.

Australian researchers questioned over 1,000 men who had developed prostate cancer and 1,250 who had not about their sexual habits.

They found those who had ejaculated the most between the ages of 20 and 50 were the least likely to develop the cancer.

The protective effect was greatest while the men were in their 20s.

Men who ejaculated more than five times a week were a third less likely to develop prostate cancer later in life.

Fluid

Previous research has suggested that a high number of sexual partners or a high level of sexual activity increased a man's risk of developing prostate cancer by up to 40%.

But the Australian researchers who carried out this study suggest the early work missed the protective effect of ejaculation because it focussed on sexual intercourse, with its associated risk of STIs.

Graham Giles, of the Cancer Council Victoria in Melbourne, who led the research team, told New Scientist: "Had we been able to remove ejaculations associated with sexual intercourse, there should have been an even stronger protective effect of ejaculations."

The researchers suggest that ejaculating may prevent carcinogens accumulating in the prostate gland.

The prostate provides a fluid into semen during ejaculation that activates sperm and prevents them sticking together.

The fluid has high concentrations of substances including potassium, zinc, fructose and citric acid, which are drawn from the bloodstream.

But animal studies have shown carcinogens such as 3-methylchloranthrene, found in cigarette smoke, are also concentrated in the prostate.

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