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Troisi, A; M. Carosi (1998). «Female orgasm rate increases with male dominance in Japanese macaques». Animal Behaviour56 (5): 1261-1266. PMID9819343. doi:10.1006/anbe.1998.0898.
«Seasonal variation in sexual behavior of all-male rhesus troops». American Journal of Physical Anthropology38 (2): 221-226. 1973. PMID4632071. doi:10.1002/ajpa.1330380214.
Fox, Elizabeth A. (2001). «Homosexual Behavior in Wild Sumatran Orangutans (Pongo pygmaeus abelii)». American Journal of Primatology55 (3): 177-181. PMID11746281. doi:10.1002/ajp.1051.
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Roselli, C. E.; Larkin, K.; Resko, J. A.; Stellflug, J. N.; Stormshak, F. (2003). «The Volume of a Sexually Dimorphic Nucleus in the Ovine Medial Preoptic Area/Anterior Hypothalamus Varies with Sexual Partner Preference». Endocrinology145 (2): 478-483. PMID14525915. doi:10.1210/en.2003-1098.
de Waal FB (1995). «Bonobo sex and society». Sci. Am.272 (3): 82-8. Bibcode:1995SciAm.272c..82W. PMID7871411. doi:10.1038/scientificamerican0395-82. «Perhaps the bonobo's most typical sexual pattern, undocumented in any other primate, is genito-genital rubbing (or GG rubbing) between adult females. One female facing another clings with arms and legs to a partner that, standing on both hands and feet, lifts her off the ground».
Paoli, T.; Palagi, E.; Tacconi, G.; Tarli, S. B. (2006). «Perineal swelling, intermenstrual cycle, and female sexual behavior in bonobos (Pan paniscus)». American Journal of Primatology68 (4): 333-347. PMID16534808. doi:10.1002/ajp.20228.
Pelé, Marie; Bonnefoy, Alexandre; Shimada, Masaki; Sueur, Cédric (10 de enero de 2017). «Interspecies sexual behaviour between a male Japanese macaque and female sika deer». Primates58 (2): 275-278. PMID28074343. doi:10.1007/s10329-016-0593-4.
de Waal FB (1995). «Bonobo sex and society». Sci. Am.272 (3): 82-8. Bibcode:1995SciAm.272c..82W. PMID7871411. doi:10.1038/scientificamerican0395-82. «Perhaps the bonobo's most typical sexual pattern, undocumented in any other primate, is genito-genital rubbing (or GG rubbing) between adult females. One female facing another clings with arms and legs to a partner that, standing on both hands and feet, lifts her off the ground».
Gruber, Karl (6 de mayo de 2016). «These male spiders perform oral sex – and lots of it». Washington Post. «Every time males engage in sex, they salivate on their mate’s genitals. “In this spider species, the male first hooks his fang to female genitals, and then salivates into them. He repeats this behavior before, between and after copulation, up to 100 times in one mating,” says Matjaž Gregorič of the Slovenian Academy of Sciences and Arts, who led the new study. Gregorič isn’t sure what motivates the behavior, which has only been recorded in two other invertebrates: fruit flies and widow spiders. The practice hasn’t been well-documented in widow spiders, so their bedroom habits don’t make the darwini's proclivity for oral activities any less mysterious.»