This cross section through several mouse testes shows how sperm are made and maintained. The testes are where sperm cells are made. A human male can produce between 70 million and 150 million sperm ...

Men with smaller testicles are more likely than their well-endowed brethren to be involved in the care of their toddlers, anthropologists at Emory University report. The higher the testosterone levels ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Men's testes were once thought to be free of bacteria, but a small new study from Italy suggests ...

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Researchers believe they have found which species has the largest testicles in relation to body weight on the planet -- and why. One of the researchers said, "We couldn't believe the size of these ...

The male testes are important areas for biological innovation, as well as being a factory for sperm. In exciting new biological research a team of scientists has found that the testes are also a ...

My 2013 book, How We Do It, addressed an enduring mystery in mammal reproduction: “It is often claimed that the word ‘testify’ comes from an ancient Roman custom in which a man would clutch his testes ...

Relationships among body mass, testis mass, sperm length, and the number of sperm produced were examined among 11 Drosophila species, after controlling for phylogenetic effects. This is the first ...

In a recent study posted to the medRxiv* pre-print server, researchers used a suite of methods to detect severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in the testis of patients who died ...

Toxic masculinity is a major societal concern. It is said that testosterone from the testes makes men overly aggressive. But the biology of hormones and aggression is not that simple. A symposium ...