A new study has found the distribution of females in 33 species of Australian rodents affects the evolution of testes size of males in these social species. Insights into reproduction and male ...

Beards are the new Beamers. Even if you can’t really judge a species’ status by its wheels, you just might be able to do so by its scruff: According to a new study, the “showy” facial hair of primates ...

Primates belong to a diverse taxonomic order, all united by one sexy pursuit. The large-nosed proboscis monkey, the large-testicled chimpanzee, and all primates in between want to have as much sex as ...

A new study from the good people at Emory University has found that a man's testicle size can determine what kind of father he can be—fathers who have a smaller set of jewels down below tend to be ...

A link between the size of a father's testicles and how active he is in bringing up his children has been suggested by scientists. Researchers at Emory University, US, said those with smaller ...

The human body is a machine whose many parts – from the microscopic details of our cells to our limbs, eyes, liver and brain – have been assembled in fits and starts over the four billion years of our ...

A study has suggested that soda consumption may increase testosterone levels and testicle size in men. The study, conducted by researchers at the Northwest Minzu University in China and published in ...

There is a new article making the rounds on the science pages of many online publications. The seemingly shocking claim is that, “Large testicles mean greater infidelity in primates.” In fact, Petter ...