Running head: WOMEN SELECTIVELY GUARD THEIR (DESIRABLE) MATES FROM OVULATING WOMEN Women selectively guard their (desirable) mates from ovulating women Jaimie Arona Krems, Rebecca Neel, Steven L. Neuberg, David A. Puts, and Douglas T. Kenrick Author Note Jaimie Arona Krems, Steven L. Neuberg, and Douglas T. Kenrick,, Department of Psychology, Arizona State University Rebecca Neel, Department of Psychological and Brain Sciences, University of Iowa David A. Puts, Department of Anthropology and Center for Brain, Behavior, and Cognition, The Pennsylvania State University Correspondence concerning this article should be addressed to Jaimie Arona Krems or Steven L. Neuberg, Department of Psychology, 950 S. McAllister St., Arizona State University, Tempe, AZ 85287-1104. Email:
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[email protected] Acknowledgements This research was supported by funds provided to Steven L. Neuberg by the ASU Foundation for a New American University. WOMEN GUARD THEIR MATES FROM OVULATING WOMEN 2 Abstract For women, forming close, cooperative relationships with other women at once poses important opportunities and possible threats—including to mate retention. To maximize the benefits and minimize the costs of same-sex social relationships, we propose that women’s mate guarding is functionally flexible and that women are sensitive to both interpersonal and contextual cues indicating whether other women might be likely and effective mate poachers. Here, we assess one such cue: other women’s fertility. Because ovulating (i.e., high-fertility) women are both more attractive to men and also more attracted to (desirable) men, ovulating women may be perceived to pose heightened threats to other women’s romantic relationships.