Approximately 15 per cent of all marriages are involuntarily childless, and another 10 per cent of couples have fewer children than they desire. In 30 per cent of these marriages, the husband can be identified as the responsible factor, and in another 20 per cent a male factor is found to have an important contributing role. However, despite the frequency of disordered reproductive function in men, the cause is unclear in a substantial percentage of the cases. For example, an identifiably endocrine abnormality is present in only approximately 20 per cent of all infertile men.1 However, this is probably a.
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