Fascinating! This is another very interesting example pointing to the possibility that highly polarized sexual orientation is not the rule in human experience, but merely a strongly enforced social construct. Not to say that of us aren’t polarized, just that a sort of bisexuality is more common than we believe.
Which stands to reason…
Why else, after all, could societies have existed in the historical past in which homosexuality was very common in some circumstances? It’s not likely, for example, that some biological phenomenon caused huge pluralities of high-status Greek and Roman males to seek out same-sex encounters in socially acceptable circumstances. (Note that I’m not holding up those circumstances as necessarily admirable.)
Some people speculate that most humans are bisexual, in the sense that they have the capability to be attracted people of both biological sexes. I wonder.