Quoting the linked Washington Times review ...
At age 17, she married social psychologist Philip Rieff, then 28, just 10 days after meeting him at the University of Chicago. The couple had a son, David, born in 1952, but divorced in the 1960s. In later years, she described her lesbian relationship with photographer Annie Leibowitz as "an open secret."
My mistake. And now it's a guess as to who was Frank.