I will give you a quote from Brian:
Connie D'Amico: You know, Meg, there's no dogs allowed here so you're gonna have to leave, but Brian can stay.
Brian Griffin: You know, Connie, I think I have a theory about why you're such a bitch.
Connie D'Amico: Excuse me?
Meg Griffin: Brian let?s just go.
Brian Griffin: No, no, no hang on, hang on. You see Connie, you're popular because you developed early and started giving handjobs when you were twelve and now you can't stand to look at yourself in the mirror because all you see is a whore. So, you pick on Meg to avoid the inevitable realization that once your body is used up by age 19 you're going to be a worn out, chalky skinned burlap sack that even your step dad won't want. How's that? Am I in the ballpark?
Take a closer look at the girls and their skin.