An orgasm a day could keep prostrate cancer away, so a new study suggests.

According to the research which was conducted by researchers from Harvard Medical School, men in the 40-49 age bracket who ejaculate 21 or more times a month reduced their risk of prostate cancer by 22%.

This was compared to men who ejaculate 4 to 7 times a month.

Men were asked about their average monthly frequency of ejaculation between the ages of 20 to 29, 40 to 49, and in 1991, the year prior to the questionnaire, they found that the more frequently a man ejaculated throughout his life, the lower his risk of prostate cancer at all 3 of these points in time.

This was the case even when they adjusted their results to take factors such as diet, lifestyle and a history of prostate cancer screening into account.

The study did not, however, explain why orgasms could lower prostate cancer risk although it has previously been theorised that regular orgasms may flush out cancer-causing chemicals in the prostate.

There is also another theory which suggests that if sperm is regularly cleaned out to allow new cells to develop, it helps stop the build-up of old cells that might be more likely to turn cancerous.

Speaking on the results of the research, Dr Jennifer Rider, of Harvard Medical School and Brigham and Women’s Hospital, said while the results are ‘particularly encouraging’ they should however be interpreted with caution.