That's an interesting question... how would a culture like the Klingon Empire regard homosexuality?
Consider our own reaction to it... even in the days where people grew more tolerant of gays, straight men were at pains to make it very clear that they might accept gays' right to be who they were, but they weren't "like that" themselves. It was un-macho. And Klingons seem to be all about macho.
Be that as it may, I think I knew Terry Farrell was leaving. But I remember being surprised at Dax's return.