Crockett, C. M., Bowers, C. L., Bowden, D. M. et al. 1994. Sex differences in compatibility of pair-housed adult longtailed macaques. American Journal of Primatology 32, 73-94.

Prefamiliarized partners were paired without ascertaining that they had established their dominance-subordination relationship. Newly formed pairs were separated for 17 hours and subsequently reintroduced daily during a study period of 23 days. Under these extraordinary circumstances male/male pairs were less compatible than female/female pairs. No female pair, but seven [47% of 15] male pairs were separated because of fighting and wounding.