You are correct in that many hotel rooms are used for a variety of sinful practices that is why it is critical for the believer to pray over the room before sleeping, open up a Bible and place it on the bed, partake of Holy Communion, and exorcise the room of all demons.
I recall being in Rome, Italy, several years back, with the opportunity to have a private audience with the late Pope John Paul II and having horrific nightmares of war. The next morning I discovered over my bed in this Italian villa was a old framed picture of a war. No wonder I had problems sleeping as over my bed was a picture of war. I often tell people that travel that they need to take extra spiritual precautions as you never know what has occured in the rooms one sleeps in (and what cursed items that might be in the room).