For getting older boys to read, the answer is much simpler, and a lot more pleasing to the eye--nudity!
More Than It Hurts You by Darin Strauss

World War Z: An Oral History of the Zombie War by Max Brooks

Watchmen by Alan Moore & Dave Gibbons

What to Eat by Marion Nestle

The Bear Went Over the Mountain by William Kotzwinkle

Lulu Meets God and Doubts Him by Danielle Ganek

See? Don't you feel like reading already?