Years ago, in the midst of a dating spree that involved numerous encounters with erratic and callous young men, I often consulted my cousin. She’s a cool, emotionally controlled New Yorker who seemed to have an innate knowledge of how to seize and maintain power in sexual or would-be sexual entanglements. She often advised me to nix the wordy message I had planned, especially in response to an outrageous slight, like a last-minute cancellation with a crap excuse and an........

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