John Piper:
I have a high tolerance for violence, high tolerance for bad language, and zero tolerance for nudity. There is a reason for these differences. The violence is make-believe. They don’t really mean those bad words. But that lady is really naked, and I am really watching. And somewhere she has a brokenhearted father.
I’ll put it bluntly. The only nude female body a guy should ever lay his eyes on is his wife’s. The few exceptions include doctors, morticians, and fathers changing diapers. “I have made a covenant with my eyes; how then could I gaze at a virgin?” (Job 31:1). What the eyes see really matters. “Everyone who looks at a woman to desire her has already committed adultery with her in his heart” (Matthew 5:28). Better to gouge your eye than go to hell (verse 29).
Brothers, that is serious. Really serious. Jesus is violent about this. What we do with our eyes can damn us. One reason is that it is virtually impossible to transition from being entertained by nudity to an act of “beholding the glory of the Lord.” But this means the entire Christian life is threatened by the deadening effects of sexual titillation.
“Among you there must not be even a hint of sexual immorality, or of any kind of impurity, or of greed, because these are improper for God’s holy people. Nor should there be obscenity, foolish talk or coarse joking, which are out of place, but rather thanksgiving” (Ephesians 5:3-4).
Read: Why I Don’t Have a Television and Rarely Go to Movies :: Desiring God