OH MY GOODNESS- you ARE WHIPPING children!? LOL! Seriously, I believe teenagers are too old for corporal punishment. We spank our 22 months and 5.5 yr. old sons. However, spanking is always reserved for direct challenge to parental authority. It is a firm reminder and a confirmation that their parents have the authority and are in charge. They are never spanked for childish acts or genuine mistakes. However, disobedience to direct and clear parental orders will be seen as a challenge to parental authority and will be punished more harshly. If children do not know that you are in charge, they’ll never listen to you.
Small kids quickly learn this pattern and the frequency of corporal punishment becomes rare. Therefore, its effectiveness increases. Spanking, like any other punishment, becomes far less effective when it is dished out too frequently. Punishments and other parental tools such as yelling will be tuned out when used too often. We reserve yelling for things that require the boys immediate compliance. Commands such as "STOP" will cause them to halt dead in their tracks because they are so shocked that we YELLED at them. This is very useful when trying to stop your children from running into the street or doing anything that will kill them.
Be creative with your teenagers. Mix your parental tools up to keep them guessing. The anticipation of how they will be punished is half of the torture. Taking privileges away, explaining the reasons of doing the right things, letting them know that they are loved no matter what (which is not to say that you are pleased with their errors), and how much it hurts those who love them when they do bad things- all will go a long way to steer big kids in the right direction. Above all, parental authority and an united front between the parents must be protected at all costs.
I am not a child behavior specialist but I did stay at Holiday Inn Express last night. YMMV.