Fred, I am surprised that someone as diligent as you would not know some things which I have already learned. Frank Davis photographed nudes, and he had been doing so since 1939. In his book "Livin' the Blues" Frank Davis mentions quite explicitly how he uses his photographic talents to mostly take nude photographs of women. He brags about how easy it is to get them to strip and pose for him.
If you listened to the video trailer, you will note that the narration describing the "Horizontal cameos" (i.e. nude photos) is in Frank Davis' voice. It was FRANK DAVIS affirming that he liked to take nude photographs of women.
You are certainly over-sure of your opinions in the absence of information which you ought to know.
As for Frank Davis' things, My recollection is that the Local University had quite a lot of Frank Davis Stuff from his office, because He had a long ongoing relationship with them. I believe he was a literary professor there or something. I've seen a video produced by students of the University who were celebrating his life. It is quite possible that some of his stuff could have been found there.
AND THAT'S WHERE GILBERT FOUND THE IMAGES.
There was nothing to identify either the source of the image or the names of the girls, just the serial number. If you or Gilbert or anyone else can make FMD and Stanley Ann Dunham out of that, be my guest.