Star Trek same sex relationships,

I think at the heart of the episode it really wasn't about being in a same sex relationship. The previous host was a male. As far as same sex couples go star trek had painted themselves as beyond these social issues. Those issues are essentially no longer a talking point and is simply accepted as thing that just is. If they actually put it as a focus in an episode it would be seen as forced and out of place.

In the new star trek movie you briefly see Sulu arm and arm with his boyfriend at the end. It was obviously a nod to the actor rather than the character. Then again, Sulu's personal life wasn't mentioned much at all in the original series and could be gay for all we know.

There was an episode in STNG that was about a race of asexual beings that were going through societal unrest because some chose to have gender either male or female. Commander Riker became involved with one of these gendered aliens.

Seth McFarlane made a better StarTrek and calls it the Orville, for a cheesy rip off it's actually pretty good, they even tackle gay and trans issues without somehow seeming overly woke.