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Where Have All the Sperm Gone? 1 in 5 Men Are 'Subfertile'

When it comes to conceiving a child, a man's got to do what a man's got to do. But researchers say a growing number of men are struggling to do just that. Around the developed world, sperm counts have been dropping for decades, leaving at least one in five men ages 18 to 25 "subfertile," according to a study released last...

Sperm Count Down: What's Killing Off America's Semen?

(Aug. 11) -- Young men of America: Your semen is dying off. That's the ongoing warning from researchers across the country, as science continues to pile new studies onto a growing heap of evidence counting against the reproductive potential of today's 20-somethings. Obesity is the latest health woe being blamed for low...