Sexual Receptivity Signal of Lordosis Posture and Intra-Sexual Competition in Women

Previous research has shown that women may use self-enhancement strategies to compete with one other. Lumbar curvature in is considered enhance a woman′s attractiveness, potentially due its role bipedal fetal load and sexual receptiveness. The current study investigated the of lumbar on women’s perceptions receptiveness as well intrasexual competitiveness. Study 1 (N = 138) tested confirmed competition influences their perception receptivity function lordosis posture depicted standing posture. 2 69) replicated these results extended them other postures, namely, quadruped supine positions. 3 106), using two-alternative forced-choice task, revealed perceive relatively larger arched-back postures more threatening relationship frequently being attractive. Collectively, this work suggests consider lordotic signal it threat relationship. This provides robust support for sexually hypothesis curvature, questioning alternative morphological vertebral wedging hypothesis.