a little ust in the show is fun...i don't mind it in the show just not as the show...this is not as the stargate turns.
(though they will end up together in 43 episodes...just have this feeling)
the sidearm joke, yeah jack wears his pistol on his right side and sam was lying on the left so...whatever she was feeling it wasn't his gun and i'll drop that one right there before padders screams.
jack definitly likes her, and she likes him, though i think there's also a bit of hero worship there at least at the beginning. course they also have to consider all the baggage both of them are carrying around.
jack's divorced, sam broke off her engagement, and killed another guy who liked her, since he is her co they are forbidden by regs to fraternize. if anyone so much as suspected there was anything going on between them, every commendation or promotion she's had since joining the sgc would be tainted. and if it came to a court martial, jack would likely be 'retired' assuming he accepted most of the blame(it is assumed that the 'dominate' personality could force the subordinate one...jack's the boss so it's assumed that he would/could have forced or coerced her into it. now if sam got out of it her career would basically be over. as far as everyone would be concerned she 'slept' her way to where she is and she'd likely be a major until she retired(maybe they'd give her a promotion to lt. colonel upon her retirement).
now if jack isn't divorced (and they're never said in canon if he & sara are divorced or just separated) then sam would be guilty of adultry and both of their careers would be toast.
there is so much on the line you can't blame them for taking it slow.