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  1. Todd K. Shackelford, Aaron T. Goetz, Faith E. Guta & David P. Schmitt (2006). Mate Guarding and Frequent in-Pair Copulation in Humans. Human Nature 17 (3):239-252.
    Cuckoldry is an adaptive problem faced by parentally investing males of socially monogamous species (e.g., humans and many avian species). Mate guarding and frequent in-pair copulation (IPC) may have evolved as anti-cuckoldry tactics in avian species and in humans. In some avian species, the tactics are used concurrently, with the result that mate guarding behaviors and IPC frequency are correlated positively. In other avian species, the tactics are compensatory, with the result that mate guarding behaviors and IPC frequency are correlated (...)
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  2. David P. Schmitt (2005). Measuring Sociosexuality Across People and Nations: Revisiting the Strengths and Weaknesses of Cross-Cultural Sex Research. Behavioral and Brain Sciences 28 (2):297-304.
    My response to the commentaries highlights three main points. First, the Sociosexual Orientation Inventory (SOI) has demonstrated adequate reliability and validity across dozens of studies, and it deserves its reputation as a useful measure of basic human mating strategies. Second, the sampling limitations of the International Sexuality Description Project (ISDP) do not negate the conclusion that sex differences in sociosexuality are likely universal across cultures. Third, the ISDP results support several theories of human sexuality, although some are based on faulty (...)
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  3. David P. Schmitt (2005). Sociosexuality From Argentina to Zimbabwe: A 48-Nation Study of Sex, Culture, and Strategies of Human Mating. Behavioral and Brain Sciences 28 (2):247-275.
    The Sociosexual Orientation Inventory (SOI; Simpson & Gangestad 1991) is a self-report measure of individual differences in human mating strategies. Low SOI scores signify that a person is sociosexually restricted, or follows a more monogamous mating strategy. High SOI scores indicate that an individual is unrestricted, or has a more promiscuous mating strategy. As part of the International Sexuality Description Project (ISDP), the SOI was translated from English into 25 additional languages and administered to a total sample of 14,059 people (...)
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  4. Todd K. Shackelford, Martin Voracek, David P. Schmitt, David M. Buss, Viviana A. Weekes-Shackelford & Richard L. Michalski (2004). Romantic Jealousy in Early Adulthood and in Later Life. Human Nature 15 (3):283-300.
    Young men are more distressed by a partner’s sexual infidelity, whereas young women are more distressed by a partner’s emotional infidelity. The present research investigated (a) whether the sex difference in jealousy replicates in an older sample, and (b) whether younger people differ from older people in their selection of the more distressing infidelity scenario. We presented forced-choice dilemmas to 202 older people (mean age = 67 years) and to 234 younger people (mean age = 20 years). The sex difference (...)
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