This question NEEDS to be farther in detail.
A Father should ONLY discipline his Daughter, And Mother To Son. This teaches our kids what the opposite sex is like, and how they will handle themselves once they're older, and in the situation where they need to think for themselves in terms of relationships. A father should never Hit his Daughter, Nor Mother to Son. ONLY discipline. Now, a mother SHOULD Hit Her daughter, and father to son. This teaches our kids to not be violent with the opposite sex, and in return they will stand up for themselves and show No remorse when they're giving the Ass beating.
Life is full of Pain. If you can't take it physically, you're going to have a hard time going down the path of riotousness.
This is how I see things. This is how I parent.