By The Telegraph 3/17/2014
“Up to a fifth of young men have a low sperm count, defined as fewer than 20 million sperm per millilitre of semen. Quite why you need so many sperm to fertilize one egg remains a mystery, but a low sperm count or poor sperm quality is the main cause of infertility in about 20pc of couples with fertility problems in the UK, and is an ‘additional factor’ in a further 25pc of cases. So what’s going on?”
Read the entire article: http://www.telegraph.co.uk/men/active/mens-health/10695991/Why-are-mens-sperm-rates-falling.html