I don't usually use references to copy my poses (*), but sometimes I need to check how muscles contract/joints bend/etc and this is when the right photo can come handy!

I used to rely a lot on gaysexpositions.guide but it's recently been paywalled... You can still browse some positions for free which is still super useful (you may not find EXACTLY what you're looking for, but something like same position-different angle which is still something).

Other than that I saved in my PC many photos over the years, I also follow some sw on Twitter to have more options!

And here's a there are few other resources I'm too lazy to use but I had bookmarked:
For faces & expressions: http://referenceangle.com
For bodies: https://webapp.magicposer.com

(*) Unrequired, but I want to say a long time ago I used to copy from photos when I still had to build my own visual library! Moving on from it was freeing and, with hindsight, I do not suggest copying 1:1 to draw your art, but copying to study and THEN putting what you learned to use. When you study, tracing photos is also SUPER USEFUL! It trains your muscle memory and helps you figure out shapes and proportions!
Of course, none of this is a must-do or must-avoid, just a general rule I follow!!