Regardless of your stance on corporal punishment, a parent is in a position of authority over, and responsible for training their children. The relationship between a parent and child is ideally a loving relationship, but it is not a relationship of equals. The parent, culturally and legally, is expected to make decisions in the child's best interest, even, sometimes, when the child disagrees. A child is not an adult.
The relationship to a spouse is fundamentally different. In this country, marriage is a union of two equals. You do not give up the legal autonomy granted to you at 18 just because you got married.
Most people would find it weird or creepy to find you were using other kinds of punishment on your spouse, even punishments that are uncontroversial when used on children, just because this implies that you are not respecting your spouse as an equal, but instead treating him or her as a child.