300-year-old Chinese abacus ring was used during the Qing Dynasty to help traders.

Besides being racist, it's also scientifically false:

All those "stats" used self reported measurements, but if we go by actual doctor measurements, THERE IS NO DIFFERENCE IN PENIS SIZE BETWEEN RACES

White penile length measurements from institutional research:

3.7 inches; University of Alberta, Canada; University of Toronto, Canada: http://www.scribd.com/doc/29971609/The-Relationships-Among-Height-Penile-Length-and-Foot-Size
5.1 inches; Department of Urology, St. Mary's Hospital, UK: http://onlinelibrary.wiley.com/doi/10.1046/j.1464-410X.2002.02974.x/full
5.6 inches; Western General Hospital, UK; Edinburgh and St John's Hospital, UK: http://www.ncbi.nlm.nih.gov/pubmed/21711435
5.2 inches; The Harriet Lane Handbook, John Hopkins University, USA: http://www.jpedhc.org/article/S0891-5245(09)00140-0/fulltext#tbl1

4.9 inches; University of California School of Medicine, San Francisco, USA: http://www.ncbi.nlm.nih.gov/pubmed/8683783
5.4 inches; Tel Aviv-Sourasky Medical Center, Israel: http://www.nature.com/ijir/journal/v12/n6/abs/3900627a.html
5.6-5.7 inches; Department of Urology, University of Essen, Germany: http://www.ncbi.nlm.nih.gov/pubmed/11182344
4.9 inches; University of Florence, Italy: http://www.ncbi.nlm.nih.gov/pubmed/11223678?dopt=Abstract
5.3 inches; Italian Society of Andrology, Italy: http://www.falloplastica.net/fp/content/dimensioni-pene.asp?layout=1
5.3 inches; Spanish Society of Andrology, Spain: http://www.pulevasalud.com/ps/subcategoria.jsp?ID_CATEGORIA=102161,

Asian penile length measurements from institutional research:

3.8 inches; Department of Urology, Seoul Municipal Boramae Hospital, South Korea: http://www.asiaandro.com/archive/1008-682X/5/185.htm
5.3 inches; Department of Urology, Chosun University, South Korea: http://www.koreamed.org/SearchBasic.php?RID=1020KJU/1998.39.11.1061&DT=1
5.5 inches; Department of Urology, Beijing Medical University, China: http://www.scribd.com/doc/103023459/Chinese-Study-1990
5.3-5.4 inches; Department of Urology, Beijing Medical University, China: http://www.scribd.com/doc/103024071/Chinese-Study-1993
5.3 inches; Department of Urology, Beijing Medical University, China: http://www.scribd.com/doc/104414559/Chinese-Study-1994-3

Black penile length measurements from institutional research:

5.3 inches; Department of Surgery, Nnamdi Azikiwe University, Nigeria: http://www.ncbi.nlm.nih.gov/pubmed/17191423?dopt=AbstractPlus

All known erect penis perimeter (also known as 'girth') measurements from formal, doctor-measured studies:

10.9 cm EG (Caucasian Jewish study) (sample size: 55) (13.6 cm BPEL)
11.17 cm EG (Korean study) (sample size: 150) (13.42 cm EL, unclear if BP)
11.25 cm EG (Spanish study) (sample size: 582) (13.58 cm EL, unclear if BP)
11.46 cm EG (Indian study) (sample size: 134) (13.01 cm EL, unclear if BP)
11.92 cm base-shaft EG (Caucasian Brazilian study) (sample size: 150) (14.5 cm BPEL)
11.93 cm EG* (Taiwanese study) (sample size: 39) (13.58 cm BPEL)
12.11 cm EG (Korean study) (sample size: 309) (14.06 BPEL)
12.30 cm mid-shaft EG (US study, Wessels) (sample size: 80) (12.9 cm NBPEL)
12.40 cm base-shaft EG, 10.96 cm glans EG (German study, group A) (sample size: 111) (14.48 cm BPEL)
10.99 cm base-shaft EG, 10.42 cm glans EG (German study, group B) (sample size: 32) (14.18 cm BPEL)
12.50 cm mid-shaft EG, 12.48 cm base-shaft EG (Chinese study) (sample size: 200) (12.1 cm NBPEL)

I didn't make this post, I had this saved but the original poster that made this post has since deleted his post so I can't link to it anymore.