A new study suggests humans belong in an elite “league of monogamy,” ranking closer to beavers and meerkats than to chimpanzees. By comparing full and half siblings across species and human cultures, ...

The real revelation, however, came from the men. Men considered a larger penis as an indicator of a rival with both greater ...

Human penis size indicates male attractiveness and fighting ability, with a larger size more attractive to women and more ...

Japanese macaques are famous for soaking in hot springs during winter, but new research suggests this behavior may serve ...

Size matters” sounds like a tabloid cliché, but for evolutionary biologists the size of the human penis is truly a puzzle. Compared to other great apes, such as chimpanzees and go ...

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

Australian researchers found that human penis size influences both female attraction and male assessment of rivals.

Rock formations in Love Valley, Cappadocia, Turkey. Nevit Dilmen/Wikimedia Commons , CC BY "Size matters" sounds like a ...

The celebrated Sundance Film Festival, opening Thursday in Park City, Utah, includes films starring Natalie Portman, Olivia Wilde, Seth Rogen and Charli XCX, plus a wide range of documentaries.

Women most often ranked male bodies more attractive when they exhibited a higher shoulder-to-hip ratio (i.e. a V-shape) and a ...

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 being one of the most cooperative species on the planet, humans routinely fail to manage shared resources sustainably ...