Social hierarchies are everywhere—think of high school dramas, where the athletes are portrayed as the most popular, or large ...

New study finds that large group size and mating systems where males have multiple mates drove evolution of deeper male voices in primates, including humans UNIVERSITY PARK, Pa. — Deeper male voices ...

Scientists say they've uncovered the neural circuitry behind desire that is responsible for sex drive, behavior and reward. “We’ve singled out a circuit in male mammals’ brains that controls sexual ...

The holidays conjure up images of romantic kisses under the mistletoe or ringing in the New Year, yet for many of us—partnered or not—these images evoke feelings starkly different from the love and ...