dug....if you get no feedback from your spouse, it is because you haven't figured out yet that you have to *push for* and *insist upon* two-way communication. If he shuts you down when you are trying to get feedback, then you are allowing him to shut you down.
If two people are intimate and close enough to actually have sex with each other, but are not close enough to discuss sex, then there are very big problems.
Stop wondering what is going on and demand answers, in a respectful and playful way. Then be prepared for honest answers, so that if you hear "well actually this and that could be a lot better" then you will not be hurt, but will actually appreciate the information so that you can make sex better for both of you. ALSO be prepared to tell him that not communicating his needs to you is turning YOU off.