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Sperm competition risk and male genital anatomy: comparative evidence for reduced duration of female sexual receptivity in primates with penile spines

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Abstract

Selection pressures influencing the way in which males stimulate females during copulation are not well understood. In mammals, copulatory stimulation can influence female remating behaviour, both via neuroendocrine mechanisms mediating control of sexual behaviour, and potentially also via effects of minor injury to the female genital tract. Male adaptations to increase copulatory stimulation may therefore function to reduce sperm competition risk by reducing the probability that females will remate. This hypothesis was tested using data for primates to explore relationships between male penile anatomy and the duration of female sexual receptivity. It was predicted that penile spines or relatively large bacula might function to increase copulatory stimulation and hence to reduce the duration of female sexual receptivity. Results of the comparative analyses presented show that, after control for phylogenetic effects, relatively high penile spinosity of male primates is associated with a relatively short duration of female sexual receptivity within the ovarian cycle, although no evidence was found for a similar relationship between baculum length and duration of female sexual receptivity. The findings presented suggest a new potential function for mammalian penile spines in the context of sexual selection, and add to growing evidence that sperm competition and associated sexual conflict are important selection pressures in the evolution of animal genitalia.

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  1. Animal Behaviour Group, Faculty of Veterinary Science, University of Liverpool, Leahurst, Chester High Road, Neston, South Wirral, CH64 7TE, UK; tel.:

    P. Stockley

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Stockley, P. Sperm competition risk and male genital anatomy: comparative evidence for reduced duration of female sexual receptivity in primates with penile spines. Evolutionary Ecology 16, 123–137 (2002). https://doi.org/10.1023/A:1016323511091

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