Perception of intensity of sperm competition on the part of males

Preferences for certain pornographic themes are hypothesized to have been influenced by our evolutionary history, where sperm competition could play a significant role. The mating system in our australopithecine ancestors, as well as in modern human societies, however, suggests that polygyny (characterized by low risk of sperm competition) has predominated over multi-male multi-female mating systems where high sperm competition is expected. In this study, a sample of men (N = 96) was investigated for their preferences for sexually explicit material showing low (sexual interaction with three women), moderate (one man and one woman) and high intensity of sperm competition (one woman and two men). The participants showed a strong and highly consistent preference for pictures showing moderate and low intensity of sperm competition. These preferences were not influenced by sociosexuality, pornography consumption or attitudes toward pornography. It is suggested that these preferences may mirror psychological adaptations for sperm competition which are activated when the risk of cuckoldry is high. Certain circumstances, where preferences for cues associated with high intensity of sperm competition would be adaptive, are discussed.