Christy was engaged to Penny's cousin while she was sleeping with Penny's brother, so Penny considers her as "kind of family". She stays with Penny during the episode and hooks up with Howard, strengthening Penny's description of her as someone who sleeps around. Indeed, Penny recounts Christy's list of every guy in Omaha she slept with, which she jokes is just a list of every guy in Omaha. She also agrees with Sheldon that she is the "whore of Omaha".