1Department of Psychology, University of New Mexico, Albuquerque.
Psychol Sci. 2013 Oct;24(10):2106-10. doi: 10.1177/0956797613485965. Epub 2013 Aug 21.
Women's sexuality, unlike that of most mammals, is not solely defined by sexual receptivity during the short window of fertility. Women demonstrate extended sexuality (in which they initiate and accept sexual advances outside of the fertile phase) more than any other mammalian female. In this light, surprisingly little research has addressed the functions of women's luteal-phase sexuality. On the basis of theory and comparative evidence, we propose that women's initiation of sex during nonfertile phases evolved in part to garner investment from male partners. If so, women should be particularly prone to initiate luteal-phase sex when the potential marginal gains are greatest. Results from a study of 50 heterosexual couples showed that women increasingly initiate sex in the luteal phase (but not the fertile phase) when they perceive their partners' investment to lag behind their own. These findings provide evidence for the distinct nature of women's extended sexuality and may contribute to a more comprehensive understanding of women's sexuality.
女性的性行为与大多数哺乳动物不同，它不仅仅由生育期短暂窗口期内的受孕能力所决定。与其他任何哺乳动物的雌性动物相比，女性表现出更长的性行为（即她们在非生育期主动接受和接受性暗示）。考虑到这一点，令人惊讶的是，很少有研究涉及女性黄体期性行为的功能。基于理论和比较证据，我们提出，女性在非生育期发生性行为的行为在一定程度上是为了从男性伴侣那里获得投资。如果是这样，当潜在的边际收益最大时，女性应该特别倾向于在黄体期发生性行为。对 50 对异性恋夫妇的研究结果表明，当女性感知到伴侣的投资落后于自己时，她们在黄体期（而不是生育期）越来越多地主动发生性行为。这些发现为女性扩展性行为的独特性质提供了证据，并可能有助于更全面地理解女性的性行为。
