Carrie discovers that Mr. Big has previously been married and has had a threesome.  Meanwhile, Carlotte's boyfriend wants a threesome; Miranda feels left out because no one's ever asked her to be in one and so she responds to a classified ad; Samantha becomes involved with a married man and the wife offers to have a threesome to keep the marriage together, but Samantha declines.

Sex and the City
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Sex and the City Season 1 Episode 8 Quotes

Carrie: Sweetie, don't you think it's weird that you're thinking of sleeping with someone you don't know, to get closer to Jack?
Charlotte: But how well do we ever know the people we sleep with?
Carrie (voiceover): That was the thing about Charlotte. Just when you were about to write her off as a Park Avenue Pollyanna, she'd say something so right on, you'd think she was the Dalai Lama.

Samantha: No muss, no fuss.
Carrie: Sounds like you're selling toilet cleaner.