Decent Study on Circumference here. You will have to get a calculator and convert from mm to inches.
1 millimeter = 0.0393700787 inch
By studying BP length to girth ratios here on Thunders, one might infer/approximate what the corresponding lengths were in these studies from 7 authors from the years 1879 to 1931. I did not bother to actually crunch Thunder data to arrive at such an estimate (maybe someone will volunteer) however, a good educated guess here is that a 1.33 to 1 ratio is a probably a good ballpark estimation of what the length to girth ratio is for most e.g. 4.5G infers 6BP; likewise 6G infers 8BP
In 1927, Robert L. Dickinson asked the librarian of the New York Academy of Medicine to search the literature for measurements of the penis. After a vain hunt the librarian wrote Dickinson: “The average writer is apt to repeat the statement that the organ varies greatly in size and without respect to the size of the individual. This seems to justify him in refraining from giving any figures” (Dickinson, 1933/1971, p. 74). The librarian found, among more than 30 prominent textbooks, only seven authors who gave figures at all. In his Atlas of Human Sex Anatomy, Dickinson presents the averages made up from the statements of these authors.
TABLE 1. Circumference measurements* of the penis (from Dickinson, 1933/1971)
In the nine years between 1939 and 1948, Kinsey, Pomeroy, and Martin collected self measurements of penile circumference in 2505 American men (Kinsey, Pomeroy, & Martin, 1948; Gebhard & Johnson, 1979). For these men, who were mainly white college students, the median (see note in box)
circumference of the flaccid penis was about 102 mm, and the median circumference of the erect penis was about 121 mm.
If you knew you could not fail...what would you attempt to do? Female Foot Fetish Current Stats: 5/4/10 8.5BPx6.0, 7.5NBP Achieved Goal and have been on maintenance program since