i know that ppl can be just as clean with hair as without, but I feel that I am cleaner with it shaven. I do leave some hair, as my skin won't allow me to be completely bald beaver. besides i know that when i go to play in his garden, i don't want blades of grass tickling the inside of my nose, so if i keep my garden clipped, i know that no grass will be tickling his nose! and there you have it from the Bio-Geek!