Granted I am not married, but I always let him know when I am feeling a little underappreciated.  I'll sit him down and tell him what's up.  I'll remind him of all the nice things I do for him (wash and fold his laundry, cook dinner when he's working late) and that I don't have to do them at all.  (We don't live together....we live about 2 miles away from each other.)  Usually he gets the picture and he shapes up.  And if he doesn't get the picture, I will get all dressed up for him, treat him like a king in bed, and then tell him after the completion that if he doesn't shape up, that could have been the last time for everything.  
  
Now, he gives me fresh flowers every week!