Old argument. That is indeterminable without following them with a camera until we see them in a romantic context or multiple contexts if they are more sexually complex. I understand you mean that the *production* has not chosen to reveal a romantic context. But were we truly without prejudice, and the world were utterly fair, sexual orientation would be unremarkable. There have been plenty of people on the bridge who might be openly gay, but we just never saw many public displays of affection (PDA) there. Maybe the problem is that the acronym "PDA" even exists - as if they are a bad thing. Get people over their repressed attitudes about open affection and sexuality at the root of it, and get over sexual orientation.We also haven't seen openly gay people on the bridge of a Starship.
And the argument that it happens but we just don't see it is even older (and 68% more laughable).
How come we did get to see it with Geordie pursuing Leah Brahms, Picard with Vash, Troi with a Riker, Troi with Worf, Riker with numerous females, Okana with the entire female crew etc etc. They don't seem to have problem showing any of this.
Hell, even Data couldn't have sex unless it was with a woman (which defies logic since he's an android).
Simple fact is, Trek gets a ridiculous amount of praise for its representations of diversity when it frankly has no right to.
Because they were crap plots, getting jammed in to appeal to a wider majority.
Having gay relationships in that context would be a waste of effort.
It's only when you get properly developed relations in DS9 is the issue more problematic.