Simple answer.
Make it a copyright issue.
i.e. The copyright of any naked pictures taken in private belongs to the subject.
If the subject choose to share pictures privately with anyone, their rights would be explicitly for personal use only, they can retain private copies, or delete them, nothing else.
The photographer has NO rights to intimate pictures. (And were they taken in secret, then obviously they would not even have implied personal use rights.)
Any breech of that, and the same rules as pirate movies or music would apply. (And we know what that's like in America.)
Obviously it would not apply to photo shoots or public displays. (For example antics a nightclub, with no ban on photography.) And of course, not if the subject has publicly published them.
The same could also be applied to the victims of crime, which would deal with happy slapping.
The main changes from the situation at present, all pictures taken in private showing nudity or the victim of a crime (anywhere) the copyright is with the subject, not the photographer.
Sharing pictures privately (or allowing personal ones to be taken) gives personal use rights only.
Pictures taken without permission in private (except when a crime is being recorded) the photographer has no rights to.
Publication of personal pictures (nudity, or other gross intrusion of privacy) would be treated as seriously as movie and music piracy.