$50nl AQ Button on BB

[L'ennemi.]

check calling the second hand
I know it sucks having to give up, but check calling is probably your worse option :a 20-14 on this flop probably has you beat unless you've been crazy with the three betting.
If you don't want to check fold, you can Cbet, even sometimes two barrels, or maybe sometimes checkraise...
depending on villains and conditions, all can be a littl spewy here but it's clearly better than check calling.
When your chek call, you're hoping that you have the best hands, and that villain will bet worse enough to make your call profitable. (btw, if you have the best hand, villain will bluff very rarely over you cbet)