In 2015, a King’s College London survey of over 15,000 men found that the average penis length while erect falls between 5.1 ...

Redback spiders live throughout Australia. William via Flickr under CC BY 2.0. While mating, a male redback spider ...

A pair of alligators offers a rare comparison between male and female size as they rest beside each other. The larger male ...

In many turtles, the temperature around an embryo can help determine whether it develops as male or female. That makes turtle ...

They do this through a clever evolutionary trick called temporal dichogamy, where the flowers of avocado trees (and many ...

Sorry, fellas — the era of the celebrated “dad bod” may be heading for the gym locker room. A new study suggests women are swiping left on softer physiques in ...

Octopuses are one of the most alien creatures on Earth. The lack of bones makes them amazing shapeshifters, most of them can change color like chameleons, and they pump blue copper-based blood through ...

When Martin Seligman, bestselling author, professor of psychology at the University of Pennsylvania and one of the most influential figures in the field, became a psychologist in the mid-1960s, the ...

Most people today have a little Neanderthal DNA sprinkled through their genome. These genomic signals are the telltale signs that overlapping populations of ancient anatomically modern humans and ...

The first time I met 3-year-old Lincoln and his mother, I didn’t get a smile. Instead, it was hesitation. His mother walked past me, turned to my paraprofessional, and asked in Spanish, “¿Eres la ...

Using life-sized digital humans, researchers reveal how genital size subtly shapes attraction and rivalry, offering new insight into why human male anatomy is so evolutionarily distinctive. Image ...