I used to trade pics through many of the old Swinger Lifestyle mag's before the internet made snail mail trades obsolete. Odyssey, Odyssey eXpress, UnReal People, ConneXion, West Coast Swingers etc. I remember going to the Post Office Box once a week for several years.
Here's the link to my thread where I posted scans from many of those 35mm photo's in my collection.
https://forum.oneclickchicks.com/showthread.php?t=82320