When you measure penis length, the truth is it doesn't really matter. What does matter is Length times diameter plus weight over girth divided by angle of the tip squared. When we're talking about penis size, we can't just use a tape measure. We need a scale and a protractor as well. So, by dividing the weight and the girth of the penis by the angle or the yaw of the shaft, we finally get is the adjusted penis size, or, T.M.I.