SPOILER ALERT: This story contains spoilers for “Rivals,” now streaming on Hulu/Disney+. British author Jilly Cooper is synonymous with sex. In the U.K., the 87-year-old has long reigned as the queen of “bonkbusters” (a.k.a. romance novels), with titles like “Riders” and “Tackle” usually accompanied by saucy jacket covers (one edition of “Riders” features a woman […]