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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.Graham Jackson, a consultant cardiologist and president of The Sexual Advice Association, says we've known for a long time that sex has health benefits, but it's only in the past decade that the taboo has been lifted from sex research in Britain.Increasingly doctors view sex as 'an under-used resource in terms of physical and emotional well-being', says Dr Arun Ghosh, a private GP with a special interest in the health benefits of sex.However, there is no doubt that sex provides a substantial workout to women's pelvic floor muscles.
In particular, the benefits were seen in the hippocampus, the region of the brain where new memories are formed.'A huge amount of brain stimulus occurs during intercourse,' comments Dr Ghosh.Foreplay is equivalent in activity terms to running for a bus.'A typical game of tennis or squash is around 40 minutes of sustained cardiovascular activity, so to compare these to sex in fitness benefits you would need to perform your peak periods of sex for around the same amount of time,' says Dr Jackson.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.A Canadian study last month found that half-an-hour of sexual activity could burn more calories than walking on a treadmill - the researchers claimed sexual activity could be considered significant exercise.