[fabadam]

A lot depends on table conditions.
At a tight table I'll open-raise JTs, even from EP.
At aggressive tables, I'll fold in EP, but I'll always limp along if someone called before me (I'll occasionally iso-raise very loose players).
I never coldcall with JTs.

If you hit a pair on the flop, you have to play poker. For me, that usually means I'll bet my hand at some stage and may fold if I get a lot of playback. What you should not do in general, is call down all the way, because that's a good recipe for donating lots of bets against someone who has you dominated.