Twins, don't make us hunt you down. We need you, lol. I agree with the heavy flirting between seasons 1-3 being pre-hookup for our boys. I always believed they hooked up at some point during season three, and as they began to become more comfortable the flirting reduced and became more knowing. After Season 5 I think there was a new edge to the relationship. The 'marriage' comments started popping up after then, I believe.