McKibbin, W.F., Pham, M.N., & Shackelford, T.K. (2013). Investigating human sperm competition in post-industrial ecologies: Cues to sperm competition predict pornographic DVD sales rank. Behavioral Ecology, 24, 819-823.

Investigating human sperm competition in post-industrial ecologies: Cues to sperm competition predict pornographic DVD sales rank.

McKibbin, W.F., Pham, M.N., & Shackelford, T.K.

 

Sperm competition theory has been used to generate the hypothesis that men prefer to view pornographic images suggesting the presence of a rival male, over images which do not. The current research uses a new methodology to address conflicting evidence about men’s preferences for pornographic images. Raters coded a random sample of 166 pornographic DVDs (from a population of 49 493), which were then analyzed using multiple regression. Consistent with the hypothesis generated from sperm competition theory, the number of images on a DVD cover and screenshots depicting 2 or more men interacting with 1 woman (suggesting the presence of sperm competition) predicts DVD sales rank, whereas the number of images on a DVD cover and screenshots depicting 2 or more women interacting with 1 man (suggesting the absence of sperm competition) does not predict DVD sales rank. Discussion addresses limitations and future directions, including using penile plethysmography to avoid relying on correlational analyses.

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Starratt, V. G., McKibbin, W. F., & Shackelford, T. K. (2013). Experimental manipulation of psychological mechanisms responsive to female infidelity. Personality and Individual Differences, 55, 59-62.

Experimental manipulation of psychological mechanisms responsive to female infidelity.

Starratt, V. G., McKibbin, W. F., & Shackelford, T. K.

 

Recent research indicates that men may have evolved mechanisms dedicated to detecting and responding to the risk of partner infidelity. Because activation of these ‘‘anti-cuckoldry’’ mechanisms depends onpartner infidelity, or the perception of partner infidelity, existing evidence for suchmechanisms relies oncorrelational data. The current study tests several predictions regarding men’s anti-cuckoldry mecha-nisms in an experimental design. As predicted, the results demonstrated: (1a) experimental activation of men’s anti-cuckoldry mechanisms by presenting them with a vignette depicting a female partner’s sexual infidelity; (1b) no activation of men’s anti-cuckoldry mechanisms by presenting them with a vignette depicting a sexual encounter without female infidelity; (2) experimental activation of men’s anti-cuckoldry mechanisms was influenced by their perceived risk of partner infidelity; and (3) women wernot influenced by the partner infidelity manipulation.

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