Abstract
The relation between sex hormones and responses to partner infidelity was explored in two studies reported here. The first confirmed the standard sex difference in relationship jealousy, that males (n=133) are relatively more distressed by a partner’s sexual infidelity and females (n=159) by a partner’s emotional infidelity. The study also revealed that females using hormone-based birth control (n=61) tended more toward sexual jealousy than did other females, and reported more intense affective responses to partner infidelity (n=77). In study two, 47 females were assessed four times across one month. Patterns of response to partner infidelity did not vary by week of menstrual cycle, but significant relations between salivary estradiol level and jealousy responses were obtained during the time of rising and high fertility risk. The implications, at least for females, are that any evolved psychological, affective, or behavioral dispositions regarding reproduction-related relationships are potentially moderated by estradiol, and that the use of synthetic hormones may disrupt this relation.
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David C. Geary is the Frederick A. Middlebush Professor of Psychological Sciences at the University of Missouri at Columbia. He has published nearly 100 articles and chapters across a wide range of topics, including cognitive and developmental psychology, education, evolutionary biology, and medicine. His two books, Children’s Mathematical Development (1984) and Male, Female: The Evolution of Human Sex Differences (1988), have been published by the American Psychological Association.
M. Catherine DeSoto recently completed her Ph.D. in psychological sciences at the University of Missouri at Columbia and is currently assistant professor of psychobiology at the University of Northern Iowa. Her research primarily focuses on the interface between biology and behavior, including the relation between sex hormones and personality disorders.
Mary K. Hoard is completing her Ph.D. studies in psychological sciences at the University of Missouri at Columbia and is currently a research specialist in the Department of Psychological Sciences. Her research interests focus on children’s cognitive development, as well as the relation between sleep and cognitive and psychological functioning.
Melanie Skaggs Sheldon is a graduate student in the Department of Psychological Sciences at the University of Missouri at Columbia. Her research interests include social cooperation, sexual behavior, and personality, as understood from an evolutionary perspective.
M. Lynne Cooper is a professor of psychological sciences and director of the training program in social psychology at the University of Missouri at Columbia. She is an associate editor of the Journal of Personality and the author of more than 60 articles and chapters in the areas of personality and social psychology. Her primary research efforts involve directing a longitudinal study of risky sexual behavior of adolescents and young adults.
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Geary, D.C., DeSoto, M.C., Hoard, M.K. et al. Estrogens and relationship jealousy. Hum Nat 12, 299–320 (2001). https://doi.org/10.1007/s12110-001-1001-2
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DOI: https://doi.org/10.1007/s12110-001-1001-2