Women's emotional and sexual attraction to men across the menstrual cycle

There is ongoing debate about how and why the menstrual cycle affects women’s attraction to men. According to the dual sexuality hypothesis, women form pair-bond relationships with men who provide care but also obtain genetic benefits by biasing mating effort towards men with high-fitness genes during the fertile phase. By contrast, the commitment hypothesis proposes that attachment bonds with primary partners function to strengthen pair-bond relationships by enhancing in-pair attraction at the fertile phase, rather than extra-pair attraction. We tested these hypotheses by measuring women’s daily sexual and emotional attraction towards men over the whole menstrual cycle. We employed (1) a urinary luteinizing hormone test to determine the day of ovulation, (2) a five-part classification of menstrual cycle that identifies a distinct peri-ovulatory phase, and (3) individualized phase identification for each participant. There was a mid-cycle rise in extra-pair sexual desire. Women gav...目前学界围绕月经周期（menstrual cycle）如何以及为何会影响女性对男性的吸引力仍存在持续争论。根据双重性假说（dual sexuality hypothesis），女性会与提供照料的男性建立伴侣绑定关系，同时在受孕期（fertile phase）将择偶投入偏向拥有高适配度基因（high-fitness genes）的男性，以此获得遗传收益。与之相对，承诺假说（commitment hypothesis）则提出，与主要伴侣形成的依恋纽带会通过在受孕期增强伴侣内吸引力（in-pair attraction）而非伴侣外吸引力（extra-pair attraction）来强化伴侣绑定关系。本研究通过追踪女性在整个月经周期内对男性的日常性吸引力与情感吸引力，对上述两种假说进行了检验。本研究采用了三类研究手段：(1) 借助尿液促黄体生成素检测（urinary luteinizing hormone test）确定排卵日；(2) 将月经周期划分为五个阶段，以明确区分出独立的围排卵期（peri-ovulatory phase）；(3) 为每名被试开展个体化的周期分期。研究发现，伴侣外性欲望在月经周期中期出现上升。女性[原文未完成]