Some interesting research suggesting that, instead of causing rapes and other crimes, porn and violent movies might actually prevent them.

Does pornography breed rape? Do violent movies breed violent crime? Quite the opposite, it seems.

First, porn. What happens when more people view more of it? The rise of the Internet offers a gigantic natural experiment. Better yet, because Internet usage caught on at different times in different states, it offers 50 natural experiments.

The bottom line on these experiments is, “More Net access, less rape.” A 10 percent increase in Net access yields about a 7.3 percent decrease in reported rapes. States that adopted the Internet quickly saw the biggest declines. And, according to Clemson professor Todd Kendall, the effects remain even after you control for all of the obvious confounding variables, such as alcohol consumption, police presence, poverty and unemployment rates, population density, and so forth. . . .

Next, violence. What happens when a particularly violent movie is released? Answer: Violent crime rates fall. Instantly. Here again, we have a lot of natural experiments: The number of violent movie releases changes a lot from week to week. One weekend, 12 million people watch Hannibal, and another weekend, 12 million watch Wallace & Gromit: The Curse of the Were-Rabbit.

University of California professors Gordon Dahl and Stefano DellaVigna compared what happens on those weekends. The bottom line: More violence on the screen means less violence in the streets. Probably that’s because violent criminals prefer violent movies, and as long as they’re at the movies, they’re not out causing mischief. They’d rather see Hannibal than rob you, but they’d rather rob you than sit through Wallace & Gromit.

Hardly conclusive, of course, but interesting none-the-less.

I guess the idea that people who are predisposed toward rape or violence might be able satiate their darker urges by watching those acts being simulated on their computers or televisions or in movie theaters makes sense on a certain level, but I’d need to see much more research into the issue before I’d be willing to draw any hard conclusions.