I've read many posts where the guy says he wouldn't mind trying it but couldn't explain it to his wife/SO. Obviously for those that have done it for years it's not an issue but not everyone is in that situation.
I wouldn't have bothered trying to explain it when I was married. It just wouldn't have happened. Now I keep it closely trimmed (I don't shave it) and anyone that sees me doesn't know there was ever a difference.