Will it cause others to stumble?

For meat destroy not the work of God. All things indeed are pure; but it is evil for that man who eateth with offence [stumbling block]. It is good neither to eat flesh, nor to drink wine, nor anything whereby thy brother stumbleth, or is offended [ensnared], or is made weak. (Romans 14:20-21)

Several things should be noted here. First, Paul speaks here of meat, drink, and the observance of certain days. This is not a blanket endorsement of all activities under the cloak of Christian liberty. To suggest that any activity is here rendered permissible is to ignore the immediate context of the chapter (related to foods that weaker brethren still stumbled over in relation to the abolition of ceremonial law) and the greater context of the apostle's writings (including condemnation of all sorts of immorality, with I Corinthians 6:9-10 and Galatians 5:19-21 as examples).

A second consideration to be made here is that Paul's use of things that fell within the realm of Christian liberty was not to flaunt his liberty, using it (as Peter writes in I Peter 1:16) as a "cloke of maliciousness." That is, where Paul knew he had liberty according to the Scriptures, in an area that caused someone else to sin or to stumble in their walk (not merely, to "be offended by it" in the way we understand "offence" today), Paul restricted that liberty. This is hardly the practice of contemporary Christianity today. It does not matter to most that their world-bridging worship, music, and culturally contextual practices lead many weaker brethren fully into the arms of the world and ungodliness. The liberty must be exercised at all costs. This is not charity, and it is not what the apostles wrote when they spoke of liberty. 

A third consideration should be of the apostle's use of the phrase, "It is good neither..." Using a form of the word καλός (meaning good, as in beautiful, as opposed to useful), Paul clearly states that it is not a good or beautiful work to cause one's brother (or sister) in Christ to stumble by the exercise of my liberty. Certainly, there is more to be contemplated when we consider his exhortation in Titus 2 to adorn the doctrine of God our Saviour with a zeal for doing good (καλῶν) works. To insist upon my liberty at the expense of my brother's walk with God does not reflect a zeal for good works.

Wherefore if meat maketh my brother to offend, I will eat no meat while the world standeth, lest I make my brother to offend. (I Corinthians 8:13)

One cannot miss the emphatic point being made here about the exercising of our liberty, when the apostle purposes to not eat meat while the world remains, rather than to cause one brother to stumble. What about your entertainment? Are there grey areas (grey according to Scripture, not grey according to your rationalization of unjustifiable amusments) in your entertainment that need to go because they are leading others into sin?