WTF?? What is this based on? You perhaps have a link to a study for us? Keep in mind that dubious claims like this will make guys question other things that you say, like your size.
I just remember reading it a few times from decently legit places on the Internet.
A tape measure tends to give larger measurements than a ruler. That combined with a side measurement and you have seriously distorted your actual size.
Side measurement really doesn’t change the result, but yeah, I should use a solid ruler. I just can’t find one.
Around here we use the standard medical measurement, I.e., a ruler along the top. 8 or 9 inches doesn’t matter, you are already larger than most of our guys will be after PE gains.
I was positive most scientific inquiries were done with side measurement, or at least that is what I remember from reading Kinsley’s.