First I have to say I havent read all post in this forum, but I have to say that romances are not allowed for Jedi's. Around level 6-7 in the Jedi starting area, you get a quest to "spy" on 2 jedi's supposedly involved in a romance, wich the 2 masters at the bridge find very disturbing. If you choose to let the 2 lovers be, you get dark side points, where if you report them, you get light side points.
So I would guess that thats why there arent that many flirt options for Jedi's - because its illigal!
I agree that it brings more depth to a game when u can flirt, but then try Sith. Only played for 10 levels as Sith, but I could flirt with everybody but my masters and same gender NPCs.