Speaking as a biologist, pubic hair is supposed to help maintain the local humidity to retain local skin moisture. It is also supposed to help lubricate the area. After trimming mine back, I noticed both of these effects, not in a positive way, but tolerable. I also had a regular SP comment during her BJ on how much nicer my balls were to lick and suck. That is a good incentive, but I prefer trimming to shaving, just as I do for pussys (unless my tongue arrives on the spot within a few hours of the shave).