Do not destroy the work of God for the sake of food. All food is clean, but it is wrong for a man to eat anything that causes someone else to stumble. It is better not to eat meat or drink wine or to do anything else that will cause your brother to fall. So whatever you believe about these things keep between yourself and God. Blessed is the man who does not condemn himself by what he approves. But the man who has doubts is condemned if he eats, because his eating is not from faith; and everything that does not come from faith is sin. (Romans 14:20-23)
Lily, let me point you to Romans. For sure Christians don't need to be watching, listening to or partaking in a lot of the worldly things that we do. It lessens our witness. Now a lot of folks think that's being a little legalistic, but it's still the truth.
With the DaVinci Code, yes it's entertainment just like any other form of entertainment. But I would hope that Christians were not stewarding God's money to watch porn. SO likewise, why would Christians want to put money in the pockets of those who would create something that is an obvious stumbling block to millions worldwide?
Should Christians go to movies in which there is profanity?nudity?
Rather than raising the bar of holiness, today's Christians seem to be dropping it so as to accommodate their lifestyles of personal enjoyment via being entertained by that which is unholy.