Average penis size grows by 24 per cent in 30 years sparking concern among scientists

It’s a statistic that most men would feel pretty pleased about but has doctors worried.

A ground-breaking study has revealed erect penis sizes have grown a whopping 24 per cent over the past 29 years.

And, while alarm bells are already ringing about a decline in sperm quality and a fall in testosterone levels, scientists say the change over a relatively short amount of time is concerning.

There are fears it could be linked to sedentary lifestyles or exposure to chemicals such as pesticides or hygiene products, with the pressure now on to pin down exactly what is driving the trend.

Stanford Professor Michael Eisenberg, who compiled the study with his colleagues, said any change was concerning because our reproductive system is “one of the most important pieces of human biology”.

“If we’re seeing this fast of a change, it means that something powerful is happening to our bodies,” he said.

“There could be a number of factors at play, such as chemical exposure, like pesticides or hygiene products, interacting with our hormonal systems.

“These endocrine-disrupting chemicals — there are many — exist in our environment and our diet. As we change our body’s constitution that also affects our hormonal milieu. Chemical exposure has also been posited as a cause for boys and girls going into puberty earlier, which can affect genital development.”

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The findings, published in the World Journal of Men’s Health this week, were from a meta-analysis of 75 studies between 1942 and 2021, and included data of 55,761 men. It was between 1992 and 2021 that penis lengths began changing, the study shows.

The pooled mean penis length estimates were: flaccid length 8.70cm, stretched length 12.93cm, and erect length 13.93cm.

It was erect length that increased significantly over time in several regions of the world and across all age groups, while no trends were identified in other penile size measurements.

After adjusting for geographic region, subject age, and subject population; erect penile length increased 24 per cent over the past 29 years.

Professor Eisenberg says that given the importance of genital development for urinary and reproductive function, more research was needed to confirm the findings and also to determine the cause of the changes.

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