I think Dede is probably the most wild one of them all . . . She's just crafty
She goes to the library, walks through stacks and when her MTV cameraman's eyes glaze over from boredom, sits quietly with a book.
Little does he know its someone else that looks much like her, hiding behind her hair, and preparing to read!
While Dede sneaks out the side door already changing into her party clothes! Then she goes out and does some hardcore partying and gratuitus hook-ups before sneaking back and trading places with her double.
Its why we don't see her in the house that much . . . why film someone always sleeping to recover from her hidden fun?
Never trust the quiet ones . . . they have the most to hide.