Interspecies relationships don’t seem to be taboo. Maz considers Chewie her boyfriend, and Chewie is practically flirting with the Resistance nurse who’s treating him. So a gay couple wouldn’t be too much of a stretch. At the moment, I don’t think Poe and Finn are more than good friends who bonded quickly in a bad situation.

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. The idea of a droid having warm fuzzy feelings for a human was repugnant to stormtroopers anyway. The fan comic Jaxxon’s 11 ran with the domestic partners idea.

Noah and Teek in Battle For Endor could easily be seen as being an old couple. Teek seems to be doing all the housework for that grumpy geezer though.