I think these two came from a late 1960's beefcake magazine.
Edited to add:  Many thanks to jsstrand for pointing out that this photo is from an early Wyngate and Bevins male nudist publication.  Those magazines were ostensibly protesting discrimination against single male nudists, but were actually pitched to gays.  Here's a link to an interesting take on the subject:
 https://www.out.com/entertainment/art-books/2013/07/03/lessons-learned-60s-era-gay-skin-mags