Most of the macaque males were behaviorally bisexual, and males that mounted each other were also more likely to back each other up in conflicts.
The study team investigated several of these prevailing theories and found that SSB with males was strongly correlated within this community. This means that the male pairs that regularly engage in SSB were more likely to support one another in conflicts and provide an advantage within the social group.
When the team looked to see if SSB led to any reduction in offspring, they found that the males engaged in SSB may actually be more successful in reproducing. This could be due to those social benefits provided by more coalitionary bonds.. This percentage is similar to other heritable behaviors in primates including grooming and sociality.They also found some genetic correlation between the males that were more often ‘mounters’ or ‘mountees’ when engaging in SSB.
The study suggests that some degree of SSB can evolve as an adaptive behavior, depending on the context, and may be a common feature or reproductive ecology in primates. “Unfortunately there is still a belief amongst some people that same-sex behavior is ‘unnatural,’ and some countries sadly still enforce the death penalty for homosexuality,” co-author and Imperial College London biologist Vincent Savolainen
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