One pair of male rhesus monkeys reared in the laboratory with exclusive social access to each other during their second year of life were observed to display reciprocal mounting with anal penetration on several occasions. Their mounts were of comparable duration to those which have been observed in matching heterosexual pairs, by contrast with the brief mounts which are often observed in dominance interactions. The postures exhibited by the mounted male resembled those typical of females during heterosexual coitus, while the mounting male displayed the species-typical male copulatory position. Each male at times assumed either role. Ejaculation was not documented during these male-male interactions, although it may have occurred. Both males performed adequately with familiar and unfamiliar females including ejaculation , but a preference test demonstrated that these males preferred contact with one another to contact with a sexually receptive unfamiliar female. These males displayed an unusual amount of affectionate behavior by contrast with other rhesus males including extended periods of contact with embracing and grooming.
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Non-reproductive sexual behavior in animals
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Non-reproductive sexual behavior consists of sexual activities animals participate in that do not lead to the reproduction of the species. Although procreation continues to be the primary explanation for sexual behavior in animals , recent observations on animal behavior have given alternative reasons for the engagement in sexual activities by animals. Observed non-procreative sexual activities include non-copulatory mounting without penetration, or by the female , oral sex, genital stimulation, anal stimulation, interspecies mating, and acts of affection.