A real-life report on penis research, featuring a curious young beauty who thoroughly studies various uniquely endowed cocks—thick ones, quick-ejaculating ones, squirting ones—and examines their mechanisms through teasing and blowjobs. Each cock is carefully analyzed, revealing distinct characteristics and reactions. The study even discovers a cock capable of male squirting, while conducting facial cumshot volume tests through direct contact with three different cocks. A threesome experiment compares thick versus long cocks to determine which feels better. Packed with dynamic interactions between the well-endowed men and researcher Kojimina.