SNM:
Because visual porn is an insult to my imagination.
Excellent point! The human imagination is a wonderful thing. Back in my single days, I used a tiny black & white TV placed on the opposite wall from my easy chair. By today's standards, the image was blurry and indistinct; but that was OK! My mind filled in every detail that my eyes couldn't see. Further, it always personalized the image in a way that pleased me, and portrayed it in brilliant color! What I saw may have been a very different image from what was actually being transmitted; but what's wrong with that?
When I read a spanking story today, that same thing happens in my mind.