The digital camera has done much to advance nude photography. With it there is no need to have pictures developped by nosy clerks at the drugstore. Storage of images is cheap and easy too... plus you can email them to spouses and close friends.
If the digital camera did those things, the smart phone puts the camera in everyone's hand at any time. Thus the naked selfie has been born. Folks snap their own picture using the bathroom mirror or forward and backward facing lenses.
If the stored versions of these selfies remain around, virtually everyone will have naked pics from many stages of their lives.. even if they never share them. With that fact, perhaps people will no longer view naked images of the human body as either "bad" or unusual.
We can only hope such changes in culture are on the way.