Born Both Ways: Is It Evolutionarily Adaptive For Women To Have A Fluid Sexuality?

Same-sex behavior has long been a conundrum for evolutionary psychologists. From an evolutionary standpoint, a trait cannot evolve unless it is linked to reproductive success (i.e., it has to help us pass our genes along to future generations). However, same-sex activity obviously limits one’s ability to reproduce, so why does it persist in the population? Most explanations I have seen to date have focused on providing an explanation for why male same-sex behavior is adaptive (e.g., the "gay uncle hypothesis," which says that having a gay uncle is adaptive because they provide resources to care for their nieces and nephew). In contrast, female same-sex behavior has largely been left out of the picture…until now. A new paper published in Evolutionary Psychology lays out a hypothesis for why women seem to have evolved a fluid or “flexible” sexuality.
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