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Playboy image from 1972 gets ban from IEEE computer journals
(arstechnica.com)
This is a most excellent place for technology news and articles.
Pretend for a moment that you're a woman. You go to the office and the men are openly sharing around a porn magazine with no concern. Does that seem like a safe professional workplace? That's essentially what this represents. It isn't what's happening anymore, but it is the origin.
People also used to smoke in offices. Safe and professional is a relatively new thing.
Decorum changes over time, but it isn't new. There's always a set of rules people follow no matter where or when you are.