In Reply to: Thats an urban myth happyhols posted by willow on Monday, 18. January 2010 at 14:06 Bali Time:
attracted to blood groups! O'Rh neg being the worst.
They are attracted by the air you expel from your lungs,this is how they know which blood group they would rather have before biting.
This is the reason some people get bitten more than others and why they always seem to be flying around your face when you are asleep.