Ambisexual behavior with male-male anal penetration in male rhesus monkeys

@article{Erwin1976AmbisexualBW,
  title={Ambisexual behavior with male-male anal penetration in male rhesus monkeys},
  author={J. Erwin and Terry L. Maple},
  journal={Archives of Sexual Behavior},
  year={1976},
  volume={5},
  pages={9-14}
}
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… 

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