Architect and amazing lover Jack, an ideal catch for princess Charlotte, whom she met at many disease benefits, strongly suggest a trio with another woman- the friends are divided if or how. Samantha does it with married 37-year old wine importer Ken Shear; when he tells his wife Ruth, she insists Sam participates in his fantasy, a threesome, to save her marriage. Carrie is surprised nearly everybody has trios, and startled Mr. Big is divorced, from publisher Barbara, who proves a great lady and even interested professionally in Carrie's on the spot invented novel theme -intolerable, as if she were in bed with her and Big- and tells he was the cheater! Irritated to be the only one not asked for a trio by a friend, Miranda answers a couple's threesome ad.

Miranda feels a double failure as neither motherhood nor professional life can get her full attention, and her neighbors give her dirty looks about her screaming baby. Samantha feels her own problems, such as a broken vibrator, are no less important, and demonstrates her expertise on the subject in the shop. Carrie encourages Samantha to acknowledge that Miranda is now a mother, and Samantha eventually offers to babysit Brady while Miranda goes to her hairdresser. When Charlotte feels uncomfortable talking tough with her attractive lawyer about Bunny's divorce terms for Trey, so she switches to his bald partner Harry Goldenblatt.