Think this bit is a misunderstanding. When AnneWest wrote
that doesn’t mean anyone’s leering at anyone, casanova-style. Leery here means wary or suspicious. Both meanings come from leer as sidelong glance, but the meanings have diverged into “wink wink nudge nudge” and “side-eye.”
Given the stereotype of bi people as promiscuous, there’s an understandable sensitivity here. But Anne wasn’t echoing that stereotype, just talking about ways to reduce the wariness of biphobic readers. (I’m dubious on that front, but don’t want to pile on.)
I’ve written a few places about gender-flipping characters (here as well as on the threads Gower linked) and much of what I’d say on orientation-flipping characters is the same. I agree with everyone who’s said that there’s not just one way to do it (as an author writing both playersexual and fixed-orientation ROs in my own game).