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

“While the human penis functions primarily to transfer sperm, our result suggests its unusual large size evolved as a sexual ...

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

The parasite that causes toxoplasmosis could play a bigger role in animal behavior than we thought, according to a first-of-its-kind study in Kenya. The research also shows that the generally nonfatal ...

Men assess potential rivals that have a larger penis as more of a threat, both physically and sexually, according to a study ...