Search for "Jung und frei Heft" (Issue) rather than photos. Sellers frequently post high-resolution photos of the covers or centerfolds to show condition. You can download these seller images (which are often surprisingly high res) using browser tools, though you must respect copyright for commercial use.
If you are looking to replicate the high-end aesthetic of publications like these using your own photography, you can use professional editing techniques: VINTAGE EFFECTS jung und frei magazine photos high quality