Next time you find yourself drawn to a best-selling erotic novel, you might want to buy your own copy rather than borrowing it from your local library. Or if you're strapped for cash, make sure you wear protection.
The reason behind our warning? Herpes. Yes, you read that right - traces of the virus have been found on a library copy of EL James 'Fifty Shades Of Grey'.
The discovery was made by bacteriology and toxicology experts, who examined the ten most borrowed books at Antwerp library.
But herpes (which was also found on a copy of Pieter Aspe's 'Tango') wasn't the only gem they uncovered - all ten of the books tested positive for cocaine.
"The levels found won't have a pharmacological effect. Your consciousness or behaviour won't change as a result of reading the tomes,"says Toxicologist Prof Jan Tytgat in a statement. But, she says, those who had read the book would test positive for cocaine.
"Today's testing methods are so sensitive that traces of the drug originating from a contaminated book will be found in your hair, blood and urine," explained Prof Tytgat.
Study authors were quick to reassure readers that the traces of the herpes virus found on the books were so small they pose no immediate health risk.
'Fifty Shades Of Grey', which was recently revealed to be Amazon's biggest-selling novel of all time, tells the story of young student Anastacia Steele who falls for a troubled billionaire Christian Grey.
The first book charts their sex life and relationship, namely Christian's predilection for sado-masochism.