Long before modern porn, there were laws that a man could not be charged with raping his wife. Society largely looked the other way when a man beat his wife. There was a time when underage women could be trafficked by their parents into marriage against their will. There was a time when a woman who accused a man of rape would basically end up on trial herself while his lawyer dragged out every single romantic or sexual relationship she had in graphic detail so that the jury would believe "she was asking for it."

I am under the impression that "unhealthy ideas about sex and the opposite sex" have been with us for a very, very long time. If we observe that porn addicts have such unhealthy ideas, are we confusing correlation with causation?