Yeah, I can't think of a time I've had to swat the rear of any of the kids over the age of 3. Ever. I've got 8 of them over the age of 3 right now. The swat is reserved for the times when a daredevil baby, who is not yet fully verbal and at the age of saying NO will mean they charge off faster just to test my mind, will charge away from me towards the street or something, I just reach out and pop their well covered bottom. They stop suddenly and turn to look at me because they are startled more than anything else that they got a pop on the rear. NEVER had one break out sobbing because of it, never had any tears.
If you have to haul off and spank an older kid (I'm going to say over 5), you need to work on your parenting first and foremost. My kids have learned by 2/3 that testing DH or me will NOT result in what they want, and flat out ignoring the rotten behavior is so highly effective in my kids, I don't see any reason to change from using it. I can haul off and spank them, which defeats the battle I'm usually teaching them to not hit a sibling, or I can ignore the tantrum and go on like I don't see the fit on the floor, and they don't get whatever they were throwing the fit for and they don't get attention, so it very quickly becomes useless, so they don't bother.
I also know teenagers test your will even more than a toddler. And teenaged girls I think are worse. And no matter how many times I'm ready to kill my 14 y/o DD, I also know it won't get me very far, she's more happy to fight back, and the most effective punishment to her is to treat her exactly like a toddler - you are whiny, bratty and breaking all the rules, well, clearly, you are tired and need to go to bed at 7 pm. And if I absolutely do not want her to do something on the computer? Simple. Our computer is locked. I have the password, DH has the password. They can't get on without one of us there. I don't want her doing something, I sit by her side until she's done, I sign off, I lock the computer. I have so many more effective means to make a teenaged girl have a miserable, boring life. She's in a mood again. Bed time is looking more and more like 6:30 pm would be a GREAT idea.