One of Jen's school friends told her that, sometimes, the boys like to hang racy cheesecake pics up in their lockers when the teachers aren't looking. She thought she could make a few quick bucks selling pictures of herself. She doesn't quite grasps the concept, but she gets to have cheesecake and nothing makes her happier than that, so it's all good!
(Good thing she's got her mother's metabolism to burn off all those sweets!)