Why do humans have larger penises than other primates? New research tests attraction, rivalry, and sexual selection for ...

This experimental study used life-sized and screen-based 3D male avatars to test how penis size, height, and body shape ...

"Size matters" sounds like a tabloid cliché, but for evolutionary biologists the size of the human penis is truly a puzzle.

Modern comforts promise ease, yet a growing body of research suggests our bodies are still tuned for a very different world. Instead of thriving, many of us are developing chronic illnesses, fertility ...

Men assess potential rivals that have a larger penis as more of a threat, both physically and sexually, according to a study by Upama Aich at the University of Western Australia and colleagues, ...

Despite its importance, the heart is one of the few tissues in the human body that can't repair damage very well – or at ...

We know that some animals are bilaterian—meaning they display bilateral symmetry—while others are not, but nature is rarely ...

Exclusive: Some scientists say many detections are most likely error, with one high-profile study called a ‘joke’ ...