From its first issue featuring Marilyn Monroe, Playboy magazine has sought well-known women to pose on its pages, a strategy that has made it one of the most iconic American magazines in history.

Securing some of the world’s most recognizable sex symbols to pose for photo shoots has been a key strategy of Playboy, allowing it to sell millions of copies — sometimes with the allure of a single model. Many of the most in-demand women are also reluctant to appear in the magazine, however, leading Playboy to make big offers — some reportedly in excess of $1 million — to encourage well-known celebrities to pose for featured spreads. In the most recent example, troubled actress Lindsay Lohan had reportedly been offered close to $1 million to appear in Playboy.