closest i've come to finding something like it is this manga sweet trap. i'd really like suggestions.
The game Hades is fairly bisexual. It has a super thirsty fan base… and I love every bit of it.
Check out the manga Blue Flag.
Pillars of Eternity II is a cRPG in the vein of Baldur's Gate and a lot of the party is bi/pan. There's four romanceable characters who are into men and women, one who is only into women but shares his body with his previous reincarnation who likes men. It's not a primary feature of the game though, closer to Bioware style romance where it doesn't have a ton of impact on the plot.
True Blood
Dragon Age, Stardew Valley, and the Sims all have multi-gender romance options where you can pursue multiple partners at the same time.
Rocky Horror Picture Show
This is a community for bisexuals, their allies, friends, family, anyone curious about us or our community, or just people who want to hang out.
Bisexual means different things to different people, and I'm not going to tell you what it should mean to you. But one thing I will say is that being bisexual does NOT mean being trans-exclusionary. We love no matter what dingles, dongles, or dangles you do or do not have in your pants.
Of course, there are the basic rules. No hate speech, no brigading, no doxing, no homophobia, no transphobia, no sexism, no racism, no illegal material. Rules will be added as needed.
At the moment, we do not have a hard and fast rule over NSFW images or posts, but I will say that this is a community about bisexuality, not for porn. Please don't make me ban NSFW content altogether.