After living the past 60-odd years dressed mostly in pajamas, Hugh Marston Hefner has left the building. Teaming with Marilyn Monroe in the first issue of Playboy Magazine in December of 1953, some say Hef was responsible for the sexual revolution that followed in the 1960s and '70s, with his daring magazine acting as the cornerstone of the Age of Aquarius and free love.

Getty Images for Playboy

There's no doubt he had an impact on the American Culture and lifestyle. The magazine he founded not only featured beautiful (and mostly naked) women, but also included articles and interesting stories about a wide variety of subjects that weren't just limited to sex and nudity.

When I was in college and any male friends were caught with a Playboy, the standard response was "I mainly read it for the articles," although the fold-out centerfolds were well covered too. I think I was in my late teens before I realized real women didn't have staples in their necks and abdomens.

Hefner chose the fast-reproducing rabbit as his iconic logo, explaining in a late '60s interview that "The rabbit, the bunny, in America has a sexual meaning, and I chose it because it's a fresh animal: shy, vivacious, jumping - sexy."

Hugh Hefner, born April 9, 1926 in Chicago, leaves behind a wife and four children, and a media legacy widely imitated but never matched.