There are so many competing values in a discussion of this nature. On the one hand, you have freedom to choose. It is our guaranteed freedom to pursue happiness. What we choose to entertain ourselves with falls into this category. Plus we have freedom of expression, what we choose to make movies of or take pictures of is our business.
On the other hand, we routinely limit or even preclude our freedoms in some areas because it serves a greater good, or protects something / someone which society feels needs such protection. Therefore we are restricted in what we say (I can not, without legal consequences, yell fire in a movie for the danger it poses), what we do (I can not, without legal consequences, drive 90 mph down the main street of my town even if I feel competent to do so), what we have access to (prior to being 21 I can not drink alcoholic beverages with out legal consequences), or how we live (I can not, even if I think it makes me happy, have 12 wives or marry a 14 year old).
The issue to me isnt whether pornography is addictive, but do we need / want to protect our society from the effects it may / may not have? Many things are addictive, as some of you have pointed out. In fact, there are people that become addicted to otherwise good things (compulsive eating, hand washing, reading, martial arts workouts, whatever).
So what is the effect? That is really the difficult thing to determine. Is pornography more harmful than valuable? The female form is beautiful, sex is wonderful, and fantasies are a great escape, some say pornography provides access to these things. Exploiting women (or men), denigrating women to fulfill sexual needs, associating violence with sex, or exposing immature children to subject they are not ready for is harmful, and some say that is at the core of pornography.
I use my imagination and ask myself this question, do I, as the father of an 8 year old girl and 10 year old boy, want my daughter treated like the women that are typically portrayed in a porno? Do I want my son to act that way? That is really the question we ask before we allow them to watch anything (and no, I dont think that a lot of people are feeding their children porno).
A problem here is two fold, first the ease of accessing internet porno, and second the increased sexual exposure in media. I get unsolicited emails containing graphic pornographic material (yes, I filter them), it is easy to access internet porn sites (and can happen quite accidentally whitehouse.com being a famous one) and TV pumps sexual messages straight into my house (yes, we are selective about what children watch but you have to be quick on the remote to jump from a commercial that you would rather not see or a football intro that raises a lot of questions). I liken it to this. Lets say that you are attempting to teach your children to eat healthy food. Yet everyday, McDonalds delivers lunch and dinner to your door without you asking for it, every time you drive to the mall McDs hands you a Big Mac, fries and coke at the door, when you walk down the street McDs hands out fries as you pass. Sure, you dont have to eat it, but it is still there. It is enticing and it is titillating (I had to use that word once here because it is so appropriate). Do you get tired of it and want it to stop? Yes.
As adults, we are responsible for our own behaviors, and society should be very careful about trying to rescue us by outlawing harmful things, even if we find them objectionable. We also have a responsibility to protect what is good and right. I have moral objections to pornography as I think it exploits women (by and large), promotes an unhealthy sexual relationship (out side of committed marriages), and reduces sex from a celebration of intimacy to a purely hedonistic pursuit. Given all of that, I could live with its existence if that is what a majority of our society really wants. What I cannot tolerate is its unwanted invasion of my home that requires my time, energy, money and vigilance to combat.
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