Saw this article just now
Honestly, to me this is a non-issue, even in the MCU. I mean they already established he is a horn dog that will fuck anything, including that one species where even Drax was like " a man who would lay with *That species I forget the name of* will do anything." So I mean, he's already polyamorous. He's fucking anything he finds hot, and it's been exclusively NON-Human for...well his entire life really. I mean he was raised by Ravagers, who only have one rule they don't break apparently "don't sell children". So I find it highly unlikely they've got any sexual hangups on par with puritanical humanity.
Do I think they will actually have him in a relationship with a dude on screen? I mean...maybe? *shrugs* Dunno. Don't really care, his arc has always been about trying to establish relationships with others, so it would be a logical story arc in a way, but I just don't see it being some kind of main plot or anything.
Anyway, that's my 2 cents, interesting but ultimately sort of redundant for MCU Star Lord, given his already established "I'll fuck them all" mindset.