日本と韓国の議論の広場

http://www.sciencedaily.com/releases/2007/05/070531114303.htm


Individual research studies have also suggested that penis size is smaller in studies focussing on older men, but Wylie and Eardley found no overall differences when they collated the results of various studies.
The review also provided little evidence of racial differences, with the exception of one Korean study where the men had smaller than average-sized penises. The authors suggest this area needs further investigation.