I had felt the way your wife felt for many years as well.... however,
The first time I presented the puddy shaved the guy was like, "GOOD LORD IN HEAVEN ABOVE!!!"
I kinda liked that.... so I kept it.
Also feels much better for the girl when she is getting properly serviced. So much better to feel his tongue against your bare skin. The hair takes away from the sensitivity.
Itches like a bitch though when it starts to grow. But when you're pierced as well you're used to always feeling like "there is something there". LOL
Tell your wife to shave it all just once. If she doesn't agree that she is waaaaaay more sensitive, ah well. At least ya tried.
Good Luck Bro!