Researchers have located one more anatomical organ where microplastics — of all shapes and constituents — are found: human testes. And although they can’t say for sure, they suspect the presence of ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. Open a medical textbook and you might learn that the inside of a man's ...

Researchers at the University of Texas Medical Branch have observed that SARS-CoV-2, the virus that causes COVID-19, can infect the testes of infected hamsters. The findings, published in the journal ...

Proper development of the fetal penis requires not just testosterone from the testes, but a second hormone produced by other tissues, including the placenta, according to a new study. The results ...

The phrase “summer long balls” might sound like locker-room slang, but it’s increasingly being mentioned on social media and online forums as a seasonal curiosity. In hot weather, men’s scrotums which ...

Photo: flickr/Udo Schmidt Fast cars. Big boats. Massive weapons. Genital size. Totally uncorrelated? Not if you believe pop psychology, or if you are a scarab beetle. Although beetles don't drive or ...

Male rodents with shorter breeding seasons tend to have larger testes, probably because the time pressure increases sperm competition between males. Studies have found that males typically have bigger ...

In prenatal ultrasounds or at delivery, many new parents look between their baby’s legs: the presence of a penis is taken as a strong sign that it’s a boy. For humans and other animals, development of ...

When competition for females is fierce, males of some species have evolved bigger testes to trounce their rivals, a new study has confirmed. Specifically, the research shows that testicle size matters ...