Sherry is one of Quagmire's sex partners in "Trans-Fat".
When Peter tries to provoke people who he believes can't hit him when he starts to identify as a woman, he insults Sully Sullenberger to Quagmire, Quagmire is angry at first, but calms down, noting that no one else respects women like he does. As Sherry arrives, he instructs her to get in the chimney so he can spit down it for her.