She’s penned one erotic novel (the summer 2016 hit “Maestra”) and led a seminar on the unbridled sex of Versailles, France, for a London cast of “Les Liaisons Dangereuses.” Now Oxford-educated historian Lisa Hilton is lending her sexpertise to an opera. “Love Hurts,” playing Friday at 7:30 p.m. at Symphony Space, seems an apt title...