TV
Charlotte treated marriage like a sorority she was desperately hoping to pledge.
— Carrie ‧ Sex and the City

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Marriage is compared to joining a sorority, with Charlotte cast as an eager applicant. The comparison emphasizes her desire to gain membership in a particular group. It gives marriage the language of admission and belonging, making that eagerness the focus of the joke.
Context reviewed