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}}</ref> In infancy, the dartos fascia operates as a one-way check valve at the tip of the foreskin, allowing [[urine]] to pass out, but prohibiting the entry of foreign matter and pathogens.<ref><!--{{FleissP HodgesF VanHoweRS 1998 |quote=The sphincter action of the preputial orifice functions like a one way valve, blocking the entry of contaminants while allowing the passage of [[urine]].}}-->{{REFjournal