S8E13: Go, Stewie, Go!
It's Meg's boyfriend, Anthony.
It's just that, lately, Peter's been making me feel so crappy about my age, and...
Well, then I'm around Anthony and he looks at me like I'm young and attractive.
I'm gonna tell you a secret, Lois.
I had an affair once.
(GASPS) You had an affair?
Mmm-hmm. It wasn't anything sordid.