Perineal swelling, intermenstrual cycle, and female sexual behavior in bonobos (Pan paniscus)

American Journal of Primatology
T PaoliS Borgognini Tarli

Abstract

Many reports have claimed that the duration of the swelling cycle in female bonobos (Pan paniscus) is longer than that of chimpanzees, and that the bonobo maximum swelling phase is markedly prolonged. Field data on intermenstrual intervals (IMIs) in female bonobos are limited and restricted to interswelling intervals (ISIs), which are assumed to reflect the IMI, though a direct comparison between the duration of ISIs and IMIs is still lacking. Reports on bonobo sexual activity as a function of the swelling phase are often contradictory. Moreover, the function of female homosexual interactions (genito-genital (GG) rubbing) is still debated. This study examines the reliability of the ISI as an approximation of the IMI, and the attractivity of female sexual swellings for other individuals. An analysis of 51 ISI-IMI pairs showed that ISIs are a fair representation of the reproductive cycle. The cycle length was 35.6+/-1.1 SE days relying on the ISI, whereas it was 35.0+/-1.1 SE days considering the IMI. This result is similar to the cycle length reported for chimpanzees. Female homosexual interactions and copulatory rates were higher during maximum tumescence, suggesting that the sexual swelling may be attractive for both males and...Continue Reading

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Oct 24, 2009·Zoo Biology·Sarah HodgkissVincent Nijman
Nov 14, 2013·PloS One·Elisabetta Palagi, Ivan Norscia
Sep 24, 2020·Scientific Reports·Elisa DemuruFlorence Levréro
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