I clear-cut the forest below the belt.
Its more a hygiene thing than anything else. Its much easier to keep yourself clean for longer (especially after messing around), its more comfortable in hot weather, and gets in the way less during oral (speaking from experience, getting something stuck in your teeth KILLS the mood). Its not the easiest thing in the world to do on a regular basis but the benefits outweigh the challenge.
I think more men do it than are willing to admit because it seems "un-manly" for some reason.
I recently had to shave my chest for a tattoo and I have to say its odd, I dont usually do it.