This was back in the 70s when I was in grad school. We were helping some friends move and part of the moving was to pack up his darkroom equipment and files. While he was taking some stuff out to the truck, I came across a bunch of 35 mm negatives sitting on the bench. Out of curiosity, I held them up to the light and discovered that they pictures of a nude woman in various poses, including some wide open crotch shots. I stuck them in my pocket and hoped that he wouldn't miss them, or would think they were lost in the move. Eventually I was able to print them myself and was surprised to find that I had a dozen nude photos of his wife. I'm pretty sure I wasn't supposed to see them... and the subject never came up.
