I almost always slowplay the nuts. Why bet on the flop? Your opponent might have nothing and just fold. If it seems my opponent has nothing, I'll check on the flop and turn and make a small bet on the river. Of course, the nuts means a hand where your opponent is usually drawing dead. If I flop the nut straight I'll always slowplay, same with a full house. But if I have QQ and the flop comes Q of club, 10 of club, 2 of diamond, I have the nuts, but this is a very bad spot to slowplay, so I always bet to try to take down the pot.