Taking the question seriously for a moment, Shax kissed T'Ana in a moment of victorious elation after a battle last season (though one could argue it was simply the heat of the moment).  But this year, in during a scene with Shax recovering in sickbay, T'Ana makes a rather immodest proposal and his normally dour scowl turns into a rather approving sealed lipped grin.
We already know T'Ana wishes to dig her, ahem, "coital hooks" into the security chief, so, no ambiguity there, and it seems Shax is intrigued in kind.