Raised by an overprotective and neurotic mother, conjoined twins, Marlena and Adrian Converse find themselves ill equipped to deal with the world around them. They have been at odds with each other since birth, fighting over which way to go, what toys to play with and what to wear. Newly ensconced in their first apartment, they are determined to learn about sex, something their mother neglected to mention. Out in the world for the first time, they manage to get themselves hired at the corner bakery as cake decorators, something they've been doing with their mother since they were children. When Joy walks through the door to order a cake for her parents anniversary party, Adrian is smitten. The feeling is mutual and the sisters have to figure out how to accommodate each other as they clumsily navigate their way through this uncharted territory. Marlena is adamant about her heterosexuality and is succumbing to the advances of Tony, an internet porn mogul who is deliberately misrepresenting himself as a car mechanic in the hopes of filming them for his website, "Freakathon."