It doesn't but surveys show it's true.
QUOTE(http://www.jackinworld.com/library/surveys/survey04.html)
Average approximate wang size based on ethnicity (age 16 and over):
• African/black: 6.74"
• Native American: 6.49"
• Middle Eastern: 6.28"
• European/white: 6.26
• Hispanic: 6.03"
• Asian/Pacific Islander: 5.50"
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"http://www.jackinworld.com/library/surveys/survey04.html".
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