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→The role of the foreskin in heterosexual relations
}}</ref>
Thorvaldsen & Meyhoff (2005) conducted a survey of 4,000 boys in Denmark. They report reported that the mean age of first foreskin retraction is 10.4 years in Denmark.<ref name="Thorvaldsen-meyhoff2005">{{REFjournal
|last=Thorvaldsen
|init=MA
|trans-title=
|language=English
|last=HelyHelard
|first=Lou
|author-link=