Most of the year I hike in a Rail Riders Eco-Speed T and Patagonia Baggies. A Houdini or Poncho covers the bad weather. This year through spring, summer, and fall I did trips in the Sierras, Illinois, Pennsylvania, Massachusetts, New Jersey, Rhode Island and a few other states and I didn't see enough bugs/mosquitoes to be a problem. I think they must be an urban legend :)
Alaska and Minnesota might be a different story.
As for the other thread on shorts and cancer... I don't understand the fear of shorts.
I do adhere to Fletcher's "Second Law of Thermodynamic Walking: Give your balls some air," whenever possible.
Had to edit this, since I spilled a Diet Pepsi on my keyboard the the Shift key is sticking.