They say the devil you know is better than the one you don't...but knowing a Devil just means there is that much more temptation

"She's Audrey Hepburn, and he's Cary Grant. She's Marilyn, and he's James Dean. She's timeless elegance, and he's old grace. She's searching, and he's already found, already taken. She's sixteen. And he's twenty-seven. But that doesn't matter. Not to a girl in love. Nothing matters, then." Edward & Bella in the definition of a forbidden relationship.