A former assistant to Larry Summers, now president of Harvard University, moonlighted as a prostitute while working in the university's hallowed halls, according to a US magazine. The woman, Kim Airs, now runs a successful sex shop in the Boston suburbs. She was Summers' assistant when he was a professor of economics. After a promotion to the office of "a very high-ranking person" whom she refused to name, she started working as a prostitute. Ms Airs told Boston magazine: "The only difference between Harvard and being a whore was the pay rate."