While testosterone levels in men have been steadily declining, the length of their dicks have increased over the past 3 decades.
scopeblog.stanford.edu
In a study published Feb. 14 in The World Journal of Men's Health, Eisenberg and his colleagues compiled data from 75 studies, conducted between 1942 and 2021, that reported on the penile length of 55,761 men. The team found that the average erect penis length increased by 24% over 29 years, a trend they saw around the world.
Eisenberg said that the increase may be another indicator that environmental exposures -- such as environmental pollutants or increasing sedentary lifestyles -- are causing reproductive-related changes.
Erect penile length is getting longer, from an average of 4.8 inches to 6 inches, over the past 29 years.

Is an increase in penile length cause for concern?
Researchers have found that over the past 30 years the length of the average erect penis has increased, and it's prompted questions.

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