We are indeed more sexually fluid than most species and given it’s “most” and not “all”, this isn’t unprecedented. It’s also not a new phenomena, in Ancient Greek and early-mid Ancient Roman societies queerness was quite common. In fact homosexuality was so prevalent that that the Romans didn’t even have a word for heterosexual/homosexual; instead one was either dominant or submissive (e.g. giving or receiving) with the assumption being that most were bisexual and would take partners as they saw fit.