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lity. Among couples with male factor infertility, the natural pregnancy rates associated with classic male factor treatments are well described. In couples with unexplained infertility, the proportion due to occult male factor is unclear. We hypothesized that many men diagnosed with unexplained infertility are actually fertile. We describe the 1-year natural pregnancy rates among couples in whom the male partner has been "cleared" of infertility on urologic evaluation. Consecutive infertile couples were recruited from a single practice (P