Way back in the olden thymes, access to pornography was limited. When I was a kid, there were magazines sold from behind the counter, books sold from the backs of those magazines and smoker films that came from sleazy vendors in big cities. Women had bodice rippers, the soft porn of romantic novels, which were sold openly in grocery stores. Otherwise, it was your imagination when it came to titillation.
The result of this was a tiny porn industry. Magazines like Playboy were “big time” in that they had a large subscriber base and were able to work from swank offices, but they were still relatively small. They maybe used three or four girls in each issue and some women would appear repeatedly so the pool of women, who made money in men’s magazines, was tiny. The same was true of smoker films and the money they made was tiny as well.