Heterosexual "friendships" among baboons and macaques:

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Heterosexual "friendships" among baboons and macaques are usually formed by subordinate males as a way to increase their mating success. These relationships typically involve grooming, protection, and social support, and can lead to sexual opportunities with females that would otherwise be inaccessible to less dominant males. Recent male immigrants may not be involved in these friendships, and the exclusion of other males is dependent on the specific social hierarchy of the group. Sexual fidelity is not necessarily a characteristic of these friendships.

Heterosexual "Friendships" Among Baboons and Macaques