Andrews Paul W, Gangestad Steven W, Miller Geoffrey F, Haselton Martie G, Thornhill Randy, Neale Michael C
Virginia Institute for Psychiatric and Behavioral Genetics, Virginia Commonwealth University, P.O. Box 980126, Richmond, VA, 23298-0126, USA.
Department of Psychology, University of New Mexico, Albuquerque, NM, USA.
Hum Nat. 2008 Dec;19(4):347-73. doi: 10.1007/s12110-008-9051-3. Epub 2008 Sep 4.
Despite the importance of extrapair copulation (EPC) in human evolution, almost nothing is known about the design features of EPC detection mechanisms. We tested for sex differences in EPC inference-making mechanisms in a sample of 203 young couples. Men made more accurate inferences (φmen = 0.66, φwomen = 0.46), and the ratio of positive errors to negative errors was higher for men than for women (1.22 vs. 0.18). Since some may have been reluctant to admit EPC behavior, we modeled how underreporting could have influenced these results. These analyses indicated that it would take highly sex-differentiated levels of underreporting by subjects with trusting partners for there to be no real sex difference. Further analyses indicated that men may be less willing to harbor unresolved suspicions about their partners' EPC behavior, which may explain the sex difference in accuracy. Finally, we estimated that women underreported their own EPC behavior (10%) more than men (0%).
尽管婚外交配（EPC）在人类进化中具有重要意义，但对于EPC检测机制的设计特征几乎一无所知。我们在203对年轻夫妇的样本中测试了EPC推理机制中的性别差异。男性做出的推断更准确（男性φ值 = 0.66，女性φ值 = 0.46），并且男性的正误差与负误差之比高于女性（1.22对0.18）。由于有些人可能不愿承认EPC行为，我们模拟了漏报如何影响这些结果。这些分析表明，只有在伴侣相互信任的情况下，双方漏报程度存在高度性别差异，才可能不存在真正的性别差异。进一步分析表明，男性可能不太愿意对伴侣的EPC行为抱有未解决的怀疑，这可能解释了准确性方面的性别差异。最后，我们估计女性对自己EPC行为的漏报率（10%）高于男性（0%）。
