Has New York's class system been replaced by a caste system? Carrie and Mr. Big exchange "I love you's", Miranda splits with her bartender boyfriend, Samantha dates a rich man with a duplicitous servant, and Charlotte gets caught in the fast lane after hooking up with a hot-shot movie star.

When it comes to relationships, how do you know when enough is enough? Big tells Carrie that he's moving to Paris for six months; Samantha introduces the girls to the hottest new S&M restaurant; Charlotte's shoe fetish is counterbalanced by a shoe store foot fetishist; Miranda meets a guy who likes to "do it" only when he thinks he might get caught.