Ducks evolved reverse spirals and sperm storage that give females surprising control, challenging long-held assumptions about ...

Dom King is known for securing a couple fan-voted awards at the GayVN Awards in the past, but the sexy model has now earned ...

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

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

“While the human penis functions primarily to transfer sperm, our result suggests its unusual large size evolved as a sexual ornament to attract females rather than purely as a badge of status to ...

Reproductive biology involves the scientific study of the reproductive system. Improved understanding of reproductive biology can lead to new treatments for reproductive disorders, such as infertility ...

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, ...