Back in the day, when the cost of film and processing made photography a relatively expensive hobby, there were only 2 safe ways to shoot nudes. One was to have your own darkroom. The other was Poloroid.
Most of us thought that was the main reason Poloroid existed, since the cost per shot was even higher and the quality was always terrible.
Why everybody "hid" their racy photos in the underwear or sock drawer is still a mystery.