Published seminal pieces by Martin Luther King Jr., Malcolm X, and Cassius Clay (Muhammad Ali). The 1970s: Peak Circulation and Fierce Competition

: Featuring Marilyn Monroe on the cover, this issue was famously published without a date because Hugh Hefner wasn't sure if there would be a second.

The early years of Playboy were defined by a rapid rise in popularity and cultural defiance.

: Series like Secrets of Playboy detail accounts of abuse, drugging, and "cleanup crews" used to hide scandals involving VIPs at the Playboy Mansion [10, 21].

: The issue featuring Swedish model Lena Söderberg remains the best-selling in the magazine's history.