There are EU characters that might be interpreted as being gay. Senator Greyshade and Master Comm in the old Marvel comics might be considered a couple.
Wouldn’t that technically be an inter-species relationship?
Also Greyshade clearly had a thing for Leia, so at least he’s bisexual, or whatever term you’d use for a man who likes women and robots who seemingly identify as male. I think I’m over-thinking this.
Anyway, I’m perfectly fine with Finn and Poe being gay, I just don’t see it happening. It’s not a chance I see Disney taking with something as profitable as Star Wars.