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}}</ref> which is a thin sheet of connective tissue. The balano-preputial lamina seals the [[preputial sac]] and prevents [[infection]].<ref name="fleiss-hodges-vanhowe1998">{{FleissP HodgesF VanHoweRS 1998}}</ref> It spontaneously breaks down over a widely-variable span of years (from about 6 to 17) and releases the foreskin from the glans penis. The average age of first foreskin retraction in Danish boys was found to be 10.4 years of age. One half were earlier and one half were later. <ref name="Thorvaldsen">{{REFjournal