10. Oscar (90210)
This freeloader spent the summer sleeping with Ivy's record-producing mom, and then took advantage of Ivy's weak moment and deflowered her. It wasn't just that he wanted to have sex with a mom-daughter duo, but rather that he had an elaborate plan to get revenge on Ivy's mom for ruining his parents' marriage. And now he's trying to get in Naomi's pants.

9. Tamara (Caprica)
Yes, we're having a hard time letting go of this show. Tamara running through the streets of New Cap City with a machine gun, taking no prisoners and destroying any and all comers (since she was a dead-walker and could be resurrected infinitely), is hard to forget. And she also shot her dad. Granted, it was virtually, but still.

8. RJ Berger (The Hard Times of RJ Berger)
It didn't take long for nerdy RJ to accept his newfound notoriety after his super-sized penis was exposed to the school. He quickly set about getting his long-time crush to notice him, but when he finally got his chance, he chose to go see his hospitalized friend Lily, instead. He had sex with Lily and then left her alone to possibly die.

7. Sally Draper (Mad Men)
She's technically not even a teen yet, but if she's this outrageous already ,she's either going to end up in a nunnery or as a proto Serena van der Woodsen by the time she's 16. Some of her naughty deeds so far include getting stinking drunk in her dad's office, running away from home, masturbating in the middle of a friend's living room and befriending a creepy kid who will no doubt become a serial killer one day.

6. Lux (Life Unexpected)
She used to have sex with a guy named Bug. Bug. Then she hooked up with her significantly older English teacher. Doesn't matter that he's cute and fairly young, he's still her teacher. Additionally, she stole her mother's car, crashed it, disappeared overnight with her teacher/boyfriend and constantly got her one friend in trouble.

5. Tyler (The Vampire Diaries)
Even before he was a werewolf, Tyler was kind of an ass. He bullied guys and girls alike, helped Vicki get drugs and forced himself on her. Now he's a werewolf because he couldn't control his temper and ended up killing a girl. That's really wild.

4. Alli Bhandari (Degrassi)
Since her freshman year, she always tarted up the second she got to school. Then she dated the school bully, had sex with him, took naked pictures of herself and text-messaged them to him and had an STD scare. She finally got a new seemingly decent boyfriend, but when he got sexts (and more) from some other girl, she overreacted and tried prostituting herself in the boiler room to a creepy guy. For a teen who's supposed to be a genius, she's an idiot.

3. Santana (Glee)
She slept with Puck, had sex with Brittany, took Finn's virginity, got a boob job, likes to run out on meals without paying, was a spy for Sue Sylvester and has some unique ideas on dating, some of which involve only hooking up with men with good credit scores. (In other words, she rocks.)

2. Dan Humphrey (Gossip Girl)
Serena and Chuck both walk around having sex with anything remotely attractive and they've both had their share of run-ins with the law and issues with drugs and the like, but we're desensitized to that by now. Dan, on the other hand, lives by himself in a huge flat in Brooklyn without any adult supervision and has sex with people like Georgina and Vanessa. And he had a threesome with Vanessa and Hilary Duff. And he listens to every hipster music act and only watches pretentious movies. That kind of behavior you just can't correct with a stint in rehab.

1. Jenna (Pretty Little Liars)
She may or may not be blind. She may or may not be responsible for killing Alison. She may or may not be sending threatening messages to our favorite foursome. She may or may not have run Hanna over. The one thing we do know? She's in love with her half-brother and has had, to put it lightly, inappropriate relations with him. And she's madly in love with him -- so much so that she's willing to have him put under house arrest so that they can continue with their illicit affair. Top that, Skins.

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