So up until very recently I've been using tinder and I found something that may be interesting to bring to the table if people haven't brought it up already.
The concept of "unicorn hunting". For those of you who aren't sure of what that is, it's basically where a couple seeks out a bi person for means of threesomes and/or casually dating as a poly relationship. I guess because a bi person who is single, willing to stay exclusive to the people in the couple, etc are hard to find (i guess??) they're called unicorns?
I dunno that as an idea (and a thing that couples actually do) sounds a little fetishistic, just as there's now a specific term for it and how that idea of open or "poly" relationships makes the couple(s) view bi people a little bit gross (as it's mostly because a bi person has an orientation that's convenient and suits their needs and that's about it, which is really iffy to me), but maybe that's just me. I only sort of get wanting to bring another person in, sure a bi person may be the best bet as a straight couple but if you're only associating with bi people on social media, maybe it's time to stop.
The whole idea of a couple finding another person to bring into the relationship to screw really really makes me think of the Toybox Killer... It's a little unsettling, and it kinda makes me think that eventually another couple are going to get arrested for kidnapping women for use as sex slaves.