Contrary to common beliefs, your urine is not germ-free. In fact, a new study shows that the urethra of healthy men is teeming with microbial life and that a specific activity—vaginal sex—can shape its composition. The research, published on March 24 in the journal Cell Reports Medicine, provides a
Contrary to common beliefs, your urine is not germ-free. In fact, a new study shows that the urethra of healthy men is teeming with microbial life and that a specific activity—vaginal sex—can shape its composition. The research, published on March 24 in the journal, provides a healthy baseline for clinicians and scientists to contrast between healthy and diseased states of the urethra, an entrance to the urinary and reproductive systems.
“It is important to set this baseline,” says co-senior author Qunfeng Dong, a bioinformatician at Loyola University Chicago. “Only by understanding what health is can we define what diseases are.” But some of the men also had a more complex secondary group of bacteria that are often found in the vagina and can disturb the healthy bacterial ecosystem of the vagina. The team speculates that these bacteria reside deeper in the penile urethra because they thrive in oxygen-scarce settings. Only men who reported having vaginal sex carry these bacteria, hinting at the microbes’ origins.
“In our study, one behavior explains 10% of the overall bacterial variation,” says Nelson, when discussing the influence of vaginal sex. “The fact that a specific behavior is such a strong determinant is just profound.”
France Dernières Nouvelles, France Actualités
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