I would not call it a cope. Even if this is the "average", it does not matter. I will explain. It is basically really simple. No man wants to have a 5 inch penis or a 6 inch penis. As a matter of fact, if one would be able to choose from a set of penis sizes, let us say, between 2 inches to 9 inches, everyone would choose 9 inches. The so called "average" size is something, that nobody wants. The "average" size is not desirable. The so called "average" is small.
As for the part about pornography. I would have to say this. Pornography did not skewed everyone's expectations. As a matter of fact, it revealed what everyone actually wants. It revealed what is actually desirable. Although, it was always there. It is universal. Everyone knows what is desirable.
I have also read this line or similar lines of "pornography skewed everyone's expectations" on Averagedickproblems and Smalldickproblems. People always tend to blame it on something else, on something arbitrary, in this case, pornography. It is not pornography. Pornography did skewed any expectation or perception. It just revealed what is.
Every man wants to have an 8 to 10 inch penis. It is not only an expectation. It is something that is desirable. It is something that every man wants so desperately.