yeah! i answered this on my old curiouscat but i'll x-post the answer here:

I tend to prefer a pinup-y/posed look. filmed porn helps me figure out a pose logistically but i usually study & reference more directly from a more static material like photography so ymmv if that's not the look you're going for with your own work

• @/oldmasc is a fav that posts a lot of vintage photography (though specific subject matter as u can see, also they post a LOT daily so maybe mute so your tl isn't filled) edit: their old account got blown up, theyre now @/theoldmasc i beieve
• http://magzdb.org/ site's in russian but a lot of old magazine scans I find here
• gaysexpositions.guide my beloved
• the super pose book series is great if you can find scans of them, they're nude photo ref books I believe are by the same people who do the real action pose series, or at least very similar presentation... better honestly for learning anatomy in general than specifically for porn but still great
• twitter has made finding people who make irl content nigh impossible lately at least for me? but of course if you can get around that, people on here who post themselves & boost other people's work will get you much more varied results (& you can support them more directly)
• i haven't used it very much until recently but reddit can be good for finding specific and self-posted photos for ref