Percentage of High School Students Having Sex With Four or More Partners 1991-2009
http://www.cdc.gov/healthyyouth/yrbs/pdf/us_sexual_trend_yrbs.pdf
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Percentage of High School Students Having Sex With Four or More Partners 1991-2009 http://www.cdc.gov/healthyyouth/yrbs/pdf/us_sexual_trend_yrbs.pdf |
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