Genital Concealment and Bipedalism: A Structural Hypothesis on the Evolution of Human Sociosexual Signaling

Why do humans conceal their genitals while other primates do not? This article proposes that bipedalism in early hominins led to a structural reorganization of the body, including the ventral repositioning and concealment of female genitals. This concealment favored the evolution of permanent sexual signals such as breasts and symbolic sociosexual behaviors. The hypothesis integrates ecological constraints, reduced sexual dimorphism, and the emergence of affective bonds and cooperative male behavior, offering a structural model of genital concealment as a social adaptation.