[VarlosZ]

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Do you always assume that your opponent as AK when he raises preflop, bets a rag flop, fires again on turn brick?

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It doesn't matter if Villain puts hero on AK specifically. What's important is that, at this point, villain is only beating a bluff, and the most likely hand for Hero to be bluffing with just made a pair. TT and even JJ probably give up (or give up more often than 1 time in 3, anyway), as do lesser hands, and QQ generally raises preflop. The only question for Hero is, how often does Villain have a hand that beats AK? It can't be often, and if villain was super-slow-playing a boat or AA, or overpaying for a flush draw, then c'est la vie.