I'll assume we'll see every combination of group in the future.
You think so? I feel like given that this game is supposedly more story-reliant and less sandboxy it would make sense for certain characters to not have an interest in group sex, or just have specific wants such as "no other dudes" or "no other chicks."
For example, I could totally see Seymour as the type that would enjoy watching a girl like Lena getting her holes plugged by a bunch of dudes, like how he seems to enjoy making her do things in front of the cam. His whole spiel about Nietzsche makes me think he wouldn't want to involve himself in the action. Nietzsche is often used narratively to imply that the character that adheres to his philosophy has some sort of "ubermench" complex where they see themself as superior to everyone else, so that could translate Seymour seeing it as degrading to involve himself in the rutting of peasants but he'd totally watch them from his throne.
I don't know how much Evakiss has thought into this concept of Seymours character, but regardless I feel like it would be more immersive if at least a few of the characters were opposed to, or at least resistant, to doing threesomes.
I always thought it would be a interesting twist to Alison's character if she's totally into wild fucking, regardless of her main fuckbuddy is Ian or Jeremy, but isn't at all into there being more than two participants. I can't recall if she ever implied she was ever into girls or had sex with more than one dude at a time previously.