Here's a little something I found while tooling around fark.com:


Austrian Study Finds Mountain Biking Harms Scrotum
Mon Dec 2,10:00 AM ET Add Science - Reuters to My Yahoo!



CHICAGO (Reuters) - Men who log 3,000 miles or more a year on their mountain bikes suffer scrotal damage that could reduce their fertility, according to a study released on Monday.



The report, based on examinations of 40 "extreme" bikers and 35 non-cyclists, suggests that men who spend the most time on their bikes should invest in shock absorbers and suspension systems that could double the cost of a standard mountain bike, the study said.


Scrotal examinations of the bikers found that 88 percent had cysts, calcification, varicose veins and other abnormalities compared to 26 percent of the non-biking group.


Sperm samples showed that the extreme bikers had a count that was only a third that of the non-cyclists while bikers' sperm had less motility or movement than non-bikers.


"We believe that extreme mountain biking results in semen alteration, which may have an impact on fertility," said lead author Ferdinand Frauscher of University Hospital in Innsbruck, Austria.


"We believe that repeated mechanical trauma to the testicles results in some degree of vascular damage and may thereby cause a reduction in sperm motility," he said.


His report was released at the annual meeting of the Radiological Society of North America."