Are not the characters in our universe and the mirror universe the polar difference of each other. Our universe gave us the will to seek out new life and build a peaceful brotherhood. The mirror universe gave us, war with other species and a drive to place others into slavery or death.
So, if Ezri, Kira and Leeta were sexural in the style you call. What would they be in our universe when it comes to sex? Just me, I just do not see Sisko seeing Ezri and Kira in a liplock.
No they are not the polar difference. They are not opposite in any way.
They look the same, have the same names but it ends there. They are completely different people.
They are more alternate than literal mirror.
So if the mirror universe Ezri came to Deep Space 9 and came into contact with Ezri Dax. I hope they will not go hand in hand and talk about we should check our spots to see if we are really alike from top to bottom. See, I know that would be a big turn on with girl on girl action. Anyway, it was a little annoying to see that happen with Kira and it would be so painful to see that with Ezri.
With our Kira, she understood there was something wrong with it. Just glad the writters did not place that same problem with Ezri Dax. Still, if there was a season 8 and they did go back with a mirror episode it begs the question if they would.