I can't speak for magazines but I do know that some "naturist video" lines have basically been a cover for showing images of nude teen & pre-teen girls. Usually it's video from Eastern Europe & mostly just slow motion video of teen girls doing things while soft music plays in the background.
There was a SCOTUS decision in the 50's which I can't recall well enough to find on Google, but it resulted in a brief period in the late 50's and early 60's where nudist magazines were declared not-obscene and they flourished (along with nudist themed movies and other media), mostly because it was one of the few legal ways to get pictures of naked people. But they declined quickly as magazines like Playboy and eventually, real porn, became legal and accessible.
The few magazines that are left (N, H&E, one or two others I can't think of of the top of my head) are genuine nudist interest mags, since no one *but* nudists would have any real interest in buying them. People with prurient interests have better outlets now - even people with a nudist fetish have their own pay sites, so there's literally no reason for them to buy magazines.
Though largely because of that, I can't imagine that they'll last much longer given the overall decline of the magazine industry.
The videos today seem to accomplish the same thing as the magazines did in the 60's, but for a much more nefarious purpose in my view. They're the closest thing you can get to legal child porn - and I'm quite certain that if you got your hands on the customer lists for these videos, the vast majority would be pedophiles. If ever the creation and distribution of child porn were legalized (and I certainly would never advocate such thing), you'd see the market for those videos dry up pretty quickly.