Objective: to investigate prolactin (PRL) with relation to male fertility.

目的：进一步了解催乳素(PRL)与男性生殖的关系。

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However, like other soya products, research suggests it may be harmful to male fertility.

然而，像其它豆制品一样，研究发现，它也许有损于男性的生育能力。

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New research indicates size - of a sort - does matter when it comes to male fertility.

新的研究表示尺寸——说法的一种——在实践中确实需要介意。

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But Dr Allan Pacey, a male fertility expert from Sheffield University was more cautious.

BBC: NEWS | Health | Surgery 'restores male fertility'

Even more controversial has been the suggestion that male fertility could be improved by correcting the varicocele by surgery.

BBC: NEWS | Health | Surgery 'restores male fertility'

There is already evidence that adequate selenium in the diet may be protective against cancer, and perhaps have an impact on male fertility.

BBC: Poor diet 'boosts virus power'