Gravel rash then. Joking aside most people not in the know think we shave our legs for aerodynamic reasons, and not so that the wife/girlfriend can give a nicer massage and that any abrasions are far easier to clean.
I shave my legs for the following reasons
1. I dont spend all this time on my bike to keep my muscles hiding under britains hairiest legs
2. Gravel Rash and king kong legs... not pleasant
3. Massage is fantastic when hair isnt being pulled from the roots
4. Better for disposal of body heat
5. Intimidation factor.. when someone sees your leg muscles pulling at every tendon and your veins popping from your legs it makes them think twice as to whether they can hang with your pace for long.