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'It's why we feel so overtaken when we orgasm,' he says.
'When researchers do MRI scans on people in orgasm, they observe both sides of the brain being stimulated, including parts of the brain we wouldn't normally use.' Though the study showed the new cells remained, 'there's as yet still no compelling evidence to support the idea that regular sex can help stave off dementia or cognitive decline in humans', adds Dr Ridley.
However, the Nottingham University research, which was published in 2009 in The British Journal of Urology International, also found that ejaculating more than 20 times a month in their 20s and 30s could increase prostate cancer risk later in life.
This is possibly because higher levels of sex hormones in some men, which may be responsible for a high sex drive, may also be linked to the development of prostate cancer later.
Unfortunately we are having less of it - on average we have sex fewer than five times a month, compared to six-and-a-half times 20 years ago, according to the National Survey of Sexual Attitudes and Lifestyles.