"I'll bet for each of them, there are a dozen that have gone under."
No doubt there are, as have many other magazines of various types. You made the point that a magazine that didn't have naked women in it but included serious articles and interviews wouldn't survive.
I gave you three prominent examples, off the top of my head. To find more would require enough research to see which serious magazines today were being published in the early 1950s. Trust me...there are plenty. You were incorrect in your supposition, simply based on the three publications I named.
Yes, many magazines have folded. That's business.