Sperm decline...

... in France.

Prof Richard Sharpe, from the University of Edinburgh, said: "Something in our modern lifestyle, diet or environment like chemical exposure, is causing this.

"We still do not know which are the most important factors, but perhaps the most likely is a combination, a double whammy of changes, such as a high-fat diet combined with increased environmental chemical exposures."

I love the way it's the usual suspects — things you're supposed to want to fix anyway, and here's one more reason why. How about considering the possibility of some causes that would be uncomfortable to admit, things you don't want to perceive as problems?