Certainly, we have always been warned about the harms of pornography. Jesus said, "Ye have heard that it was said by them of old time, Thou shalt not commit adultery: But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart" (Matt. 5:27–28). But the prophets have become increasingly insistent in their warnings during the last several decades. This spike in prophetic warning corresponds to the development of technology.
Preston, Cheryl B.
"The Misunderstood First Amendment and Our Lives Online,"
BYU Studies Quarterly: Vol. 49
, Article 3.
Available at: http://scholarsarchive.byu.edu/byusq/vol49/iss1/3