Playboy is an American men's lifestyle and entertainment magazine. It was founded in Chicago in 1953 by Hugh Hefner and his associates, and funded in part by a $1,000 loan from Hefner's mother. Notable for its centerfolds of nude and semi-nude models (Playmates), Playboy played an important role in the sexual revolution and remains one of the world's best-known brands, having grown into Playboy Enterprises, Inc., with a presence in nearly every medium. In addition to the flagship magazine in the United States, special nation-specific versions of Playboy are published worldwide.