Thank you for the replies to the questions and the added information. It helps a lot in understanding what the situation is. I believe I can now be of help with this issue.
I can indeed imagine how daunting this situation must be for you. You are clearly a loving and caring parent and he's lucky to have you there. And he's a good kid and that's also such a wonderful advantage here.
And this is actually the key to my answer to you that you need to consider and think about. Today, pornography is such a pervasive part of our society. I just read a report of a study conducted with young adults in their 20s that reports that 74% of them have watched pornography as part of their growing up. And the majority report that this has hampered their having a close personal relationship with the other sex and forming a lasting relationship. The study was talking about viewing pornography as teens and up, which is not your son's situation. I haven't seen the study itself to know how sound it is, but even if the numbers are not accurate, we can see that you can't just approach the situation in a simple way of telling your son pornography is awful and he should never do this again and it will ruin his life. This approach clearly didn't work with the majority of kids who are now young adults and it will not work with kids today as well.
Instead, you have to approach the viewing of pornography from within your family values. In other words:
That our family lives by beliefs that we hold to be true and important. They are what keep us together and a loving family. There are a number of things that people do out there that we know they think is fine and that are legal and that they want to do so they do it. But we know that those things are not what make us good people and a strong family and loving, caring people.
One of these things is watching other people in sexual situations. Because this takes away the specialness of the relationship between people that sexual activity is able to do. Sexual activity is something that can make people love each other. But it is something that can become cheapened and pornography can take the love out of it. That's not what we believe in.
This is the outline, then, of what you are seeking to convey to him. Again, you are not trying to portray it as intrinsically wrong, that it's just wrong and that's it. Because he's going to face too many forces out there in the coming years that will tell him otherwise. You are instead telling him that sex can be part of love or it can cheapen love. And your family believes in strengthening love and caring for the people you love.
Okay, I wish you the very best!
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