[1] In 1950s and 1960s United States, it was generally agreed that nude photographs were not pornographic unless they showed pubic hair or genitals.
"[2] In order to retain its market share, Playboy followed suit, risking obscenity charges, and launching the "Pubic Wars".
[1] Playboy, however, had actually first showed a very slight glimpse of any pubic hair on Melodye Prentiss' centerfold (Miss July 1968), some 15 years after the magazine's introduction.
When Hustler was launched in 1974, it outdid both Playboy and Penthouse in explicitness by showing more graphic photos of the female sex organs.
[1] Penthouse gravitated towards raunchier images, ultimately arriving at hardcore pornography and photographs of women urinating, in the mid-1990s.