“But even generously granting the assumption that a correlation does exist between pornography and violence, what would such a correlation tell us? It would certainly not indicate a cause-and-effect relationship. It is a fallacy to assume that if A can be correlated with B, then A causes B. Such a correlation may indicate nothing more than that both are caused by another factor, C. For example, there is a high correlation between the number of doctors in a city and the number of alcoholics there. One doesn't cause the other; both statistics are proportional to the size of the city's population.”