Originally Posted by TL4everu2
From what I understand, a lot of guys do it because they like oral from their women. This helps to keep the pubic hairs out of the womans mouth.
There is also another train of thought on the matter. Some guys do it because it makes them appear larger than they actually are.
+1 to ^ both of these reasons.
Also, I get hot easily, and don't need the extra insulation. I trim up top pretty short, and shave everything underneath. Nothing to it, once you get the hang of it, just gotta be careful!