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Sperm competition occurs when the sperm of two or more males simultaneously occupy the reproductive tract of a female and compete to fertilize an egg. We used a questionnaire to investigate psychological responses to the risk of sperm competition for 194 men in committed, sexual relationships in...
Asymmetries are negatively associated with developmental precision. However, asymmetries in human traits, which consist partly or entirely of soft-tissue, are correlated with a surprising diversity of fitness domains, including fertility, disease resistance, running speed, aggression, and...
Evolutionary communication theory posits that signalers and receivers are in a coevolutionary arms race. Receivers attempt to predict the behavior of signalers, and signalers attempt to manipulate the behavior of receivers (often through the use of dishonest signals of intent). This has led to...
Previous investigators have confirmed the evolutionary hypothesis that the sexes differ in their responses to sexual vs. emotional infidelity and have taken their results as suggesting the existence of a mechanism that regulates the perceptions of threat, the emotional responses, and the...
The number of responses to personal advertisements can be a good source of information about preferences within the human mate market. From an analysis of responses to 551 advertisements placed by males in a local Lower Silesian (Poland) newspaper and 617 placed by females, we assessed which...
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