Sperm Counts - a podcast by BBC Radio 4

James Gallagher investigates whether there is a decline in male sperm including the results of his own sperm count analysis. He meets a couple who conceived after having treatment for a varicocele, enlarged veins in the testes that can heat the sperm up and the leading known cause of male infertility. And James is joined by leading scientists in the field to debate whether sperm counts are falling.

Producer: Erika Wright

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