Not true. Depending on what the data was gathered for there are npbel, bpel and fsel measurements depending on the study.Right. And there is nothing “scientific” about the requirements. The most widely known scientific method for measuring a penis is bone pressed and flaccid stretched, not non-bone pressed and erect. Very, very few studies measure erect. And I don’t know of any that measure non-bone pressed. The findings for both classes of measurements are not always consistent. Some men are up to .5 inches more flaccid stretched than they are erect.
Wessels, Promodu and Sengezer for example were nbpel. For clinical studies that measured bpel only Schneider comes to mind right now.