Sorry men, the 'boys' aren't swimming the way they should

SPERM concentrations in Western men have declined by more than 50 per cent over the past 40 years, according to a major new study.

The study, led by Israeli researchers, reviewed hundreds of studies into sperm quality between 1973 and 2011.

In all, 43,000 men were studied.

"These findings strongly suggest a significant decline in male reproductive health, which has serious implications beyond fertility concerns," the authors said.

Researchers found an increasing proportion of men had sperm counts below the threshold for infertility.

More at ABC News

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Gallery exhibits a 'portrait' of Lismore

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