Evolutionary Biology
Sperm competition, mate guarding, and the evolutionary logic of shared mating.
Sex at Dawn and the Case Against Monogamy's Origin Story
In 2010, evolutionary biologist Christopher Ryan and psychiatrist Cacilda Jethá published *Sex at Dawn*, arguing that human mating systems evolved for
Penile Morphology and Semen Displacement: The Gallup Research
Evolutionary biologist Gordon Gallup's research on penile morphology as a semen displacement mechanism represents one of the most direct lines of evid
Why Men Who Mate-Guard Less Produce Better Sperm
In evolutionary terms, male reproductive strategy operates under a fundamental constraint: time and energy allocated to mate guarding cannot simultane
Sperm Competition: The Biology Your Body Already Knows
Your body is built on an ancient battlefield. Every anatomical feature, every biochemical response, every reflex that fires during sex carries within
When Being a Cuckold Makes Evolutionary Sense: Yale Research on Fitness Advantage
A counterintuitive body of research has emerged from the study of ancestral human mating systems: under specific ecological and demographic conditions
The Coolidge Effect: Why Novelty Is Biologically Wired
The Coolidge Effect describes a phenomenon documented across species: a male who has habituated sexually to a familiar female will show renewed sexual