Pham Michael N, Barbaro Nicole, Holub Andrew M, Holden Christopher J, Mogilski Justin K, Lopes Guilherme S, Nicolas Sylis C A, Sela Yael, Shackelford Todd K, Zeigler-Hill Virgil, Welling Lisa L M
1 Oakland University, Rochester, MI, USA.
Evol Psychol. 2018 Jan-Mar;16(1):1474704918757551. doi: 10.1177/1474704918757551.
Sperm competition theory can be used to generate the hypothesis that men alter the quality of their ejaculates as a function of sperm competition risk. Using a repeated measures experimental design, we investigated whether men produce a higher quality ejaculate when primed with cues to sperm competition (i.e., imagined partner infidelity) relative to a control prime. Men ( n = 45) submitted two masturbatory ejaculates-one ejaculate sample for each condition (i.e., sperm competition and control conditions). Ejaculates were assessed on 17 clinical parameters. The results did not support the hypothesis: Men did not produce higher quality ejaculates in the sperm competition condition relative to the control condition. Despite the null results of the current research, there is evidence for psychological and physiological adaptations to sperm competition in humans. We discuss methodological limitations that may have produced the null results and present methodological suggestions for research on human sperm competition.
男性会根据精子竞争风险改变其射精质量。我们采用重复测量实验设计，调查了相对于对照启动，当用精子竞争线索（即想象伴侣不忠）启动时，男性是否会产生质量更高的射精。男性（n = 45）提交了两份通过自慰获得的射精样本——每种条件（即精子竞争和对照条件）各一份射精样本。对射精样本的17项临床参数进行了评估。结果不支持该假设：相对于对照条件，男性在精子竞争条件下并未产生质量更高的射精。尽管当前研究结果为阴性，但有证据表明人类对精子竞争存在心理和生理适应。我们讨论了可能导致阴性结果的方法学局限性，并提出了关于人类精子竞争研究的方法学建议。
