Carrie starts freaking out about the idea of marrying Aidan in "Change of a Dress."
Added:

Sex and the City Season 4 Episode 15 Quotes

Do you realize you're growing a teeny tiny penis inside you? That is so sci-fi!

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Samantha: (to the girls) I think I have monogamy. I caught it from you people.
Carrie: Now it's airborne.