When you play Texas holdem low limit you can call a flop bet with pairs that are second best in the table.  If you have a chance to make a backdoor flush, a call with a second best pair is not a bad play indeed.  But when there is going to be a sudden aggression from someone else that play Texas holdem in the table, it is either because they are trying to identify your pair against theirs and a sudden aggression can be one that is bad for you.

If the player that is going in sudden aggressive betting is actually betting on the come for a four flush, he is making a semi-bluffing and this is one of the best situations that can be for you because you are playing with a second best pair counting on a backdoor flush.  The bad turns for you can be when you play Texas holdem with this opponent if he has been slow playing a 33 or 77, if he has just seen 88, he had a big Ace and was slow playing, he made A8 with two pairs or if he had 8-7.

In many cases when you play Texas holdem with a second pair you have to see for card ranks that are adjacent to it with your opponent.  In cases where you assume that your opponent is sitting there with two pair, you might have to consider the odds to decide on whether you have to call.  If the board when you play Texas holdem in this situation is going to be like you have odds of 9 to 1 better fold and this can be one of the cutest decisions you would have made. Never get fooled thinking that your opponent is bluffing in this situation, you better fold your hand, and you will save a bad beat horror.

Well when you play Texas holdem you can play with second best hands, but you should be smart enough to have your real opponent fold.  To do that when you play Texas holdem poker you must know to make them believe that you are better than they. Making such happen is subject to position and in most cases, if the opponent is a pro he will know and wait to judge if you are bluffing with a second best hand too.  So, make your judgment based on what others are probably thinking about you also. Do not consider the decision based on just your thinking.