So I just watched It (1990) - dubbed in my native language NOT English, haven't read the book or seen any other adaptation. //Some spoilers.//
I found it interesting how Beverly expresses romantic feelings for the whole group, both as a child and adult. Yes, it is complicated by her seeking out male validation but.
When they're kids, her and Richie joke about the movie being a date between the two of them. Eddie points out it was a group outing, so she says it can be a date between her and Eddie at the same time and kisses him on the cheek.
When they meet up in the restaurant and she kisses everyone through Bill most of all. It looked distinctly like she kissed some of the others on the mouth. Notably Mike. Even though it's in front of the others, no one protests any of it, just looks on.
She hasn't confirmed whether they're single yet, that happens later, but a theme appeared to be that they reconnect like no significant time apart matters, so I'm not too bothered. In the Clubs interactions, they seem to be in their own bubble and the rest of the world comes second.
I was honestly concerned when Aubra considered following her husband Bill to Derry. I wondered what she would find when she got there. Was almost relieved when that didn't happen.
After, when they're all six reminiscing in the hotel room, Ben is sitting behind Beverly with his hands on her cheeks and she says "that's when I fell in love with you all".
Some of the scenes between the others can be read as either romantic or platonic. There's a lot more ambiguity there.
I'm aware that Beverly is "permitted" to express herself this way, and the other's are "allowed" to respond to her in kind, due to her status as the token girl of the group. She can ambiguously be as anyone's and everyone's girlfriend.
This is all before her and Ben officially get together. When they do, Eddie has just come to call on them. He stays at the top of the staircase for a moment and looks at them like he can feel the end of something.
Only other person to explicitly express feeling similar IS Eddie, when later he says he's a virgin because he couldn't sleep with someone he didn't love, and he only loves the rest the Club. The men are included in that statement, not just Beverly. It comes across as airing things out in the open to try and preserve what they have. Richie responds, "I can't help you there."
Eddie's soon after killed. The rest of the cast split into heterosexual pairings - Bill/Audra, Ben/Beverly - or remain single. When I had just hoped they'll be allowed to remain together and allow for some ambiguity on their relationship status. Makes me really feel the absence of Sten, the self-described sex maniac, and what perspective he would have brought to the reunion.
In conclusion, the 1990 Loser's Club is poly, at least in Bulgarian.