A leading Christian, Robert George, and a leading Muslim, Shaykh Hamza Yusuf, sent hotel industry executives a letter last week:
We write to ask you to stop offering pornographic movies in your company’s hotels. We make no proposal here to limit your legal freedom, nor do we threaten protests, boycotts, or anything of the sort. We simply ask you to do what is right as a matter of conscience.
We are, respectively, a Christian and a Muslim, but we appeal to you not on the basis of truths revealed in our scriptures but on the basis of a commitment that should be shared by all people of reason and goodwill: a commitment to human dignity and the common good. As teachers and as parents, we seek a society in which young people are encouraged to respect others and themselves—treating no one as an impersonal object or thing. We hope that you share our desire to build such a society.
It’s excellent and brief. Read the whole thing.
The Witherspoon Institute has also published The Social Costs of Pornography: A Collection of Papers
Price will come to $9.00/copy (including shipping) if you order five copies. Please allow 7-10 days for delivery. 
Some hotels have removed the movies because sales were down so much. Sounds like great news, but the reason is that people were just getting on the internet and downloading their own.