What about the tourture method?

What's the best place to turn when you have a parenting dilemma? Wise and knowledgeable parents? Trusting friends? Co-workers? NO, NO, NO. It's the Internet, of course. My trusty sidekick, Google, has helped in so many ways. From sauteing chicken to making Advent calendars, he sure does know it all. But not even Wiki How can help this time....I've got a trouble-maker kid. I can't hardly believe that it's true. He has always been so sweet, polite, and well-mannered. Now he is a disobedient and defiant. What the hell happened. The only thing I can come up with is the new addition to our family, Mady-Lou. The only problem with that theory is that she has been a "new" addition for over 4 months now without any issues. I suppose the novelty of being an older brother has worn off and it's not so fun sharing the attention of his parents anymore. So, fellow Internets, what course of action do I take. We have made sure to stop poor behavior in the act and remind him of what the better choice would be. We have grounded. We have taken away every privilege possible. Nothing. Works. I'm sure he is testing the waters and pushing his limits, he's probably at that age but I swear if I get one more call from his teacher, my ears will bleed. He was even caught peeking in the girls' restroom today. Oh. My. God! Of course he was just be naughty, I'm sure there couldn't have been any perverted intentions (I am definitely NOT prepared to deal with pervertedness yet). I am just SO frustrated! Maybe I should just quit my job and home school...yeah, right.