Gender-neutral as I recall, or getting there, which is a good thing, I'd wager.
I'm almost positive Kenderwizard would think so.
Spoiler
Mostly second hand from bisexual acquaintances or friends, but, yeah, once or twice run into it personal-like.SpoilerI think it's a tie-in with the whole depraved bisexual stereotype. :/
Come to think of it a bit more, I do seem to recall possibly having had a discussion with one bisexual friend who was getting a bit sexually frustrated, though in retrospect I can't recall whether it was due to their partner's sex or just their partner's hangups. Definitely have run into a group of loosely-connected poly individuals who more or less freely admitted that their nigh-constantly shifting web of relationships and who was sleeping with whom was in part due to getting bored with a single sex of sexual partners initially that had started that group.
No idea how indicative of anything that group was, as they did seem keen on expanding, nearly completely devouring and/or destroying one of the social groups I had attached myself to at the time.
I think I almost got preemptively warned away from trying to exploit such a thing by one of my friends back during a muddled period actually. Thankfully segued into a discussion of how many friends she'd lost due to them being biphobic or trying to get into a threesome with her girlfriend and herself rather than continuing in more personally awkward waters.