Following up on my comment here. From Real Sex, by Lauren Winner:
"This is how sin works: it whispers to us about the goodness of something not good. It makes distortions feel good. It tells us we'd be better off with pleasure in hell than sanctification in heaven."
- and later she makes this very good point -
"If our feelings could be trusted - If we felt good every time we did something good, and felt bad every time we did somthing bad - we would need neither biblical guidelines of right behavior nor a community to help hold us accountable to those biblical standards."