Guys I do not understand you. For each studio offering a membership you can check what content are included or not included before to make the purchase.
For example, go here:
https://pornbox.com/application/studio/111From the menu "Access via", select membership, you will see a list of all scenes included in the membership. If you select "Direct Purchase" (from the same menu), you can see the scenes that are available for direct purchase ONLY.
As you see, there are several menu options: "Newest" "Period" "Tag" "Ownership" "Access Via" and "Models". This allows you se make combinations of selection to have detailed list