https://help.yahoo.com/kb/flickr/safety-levels-flickr-sln110...
Safe - Content suitable for a global, public audience.
Moderate - If you're not sure whether your content is suitable for a global, public audience, but you don't think that it needs to be restricted.
Restricted - This is content you probably wouldn't show to your mother, and definitely shouldn't be seen by kids.
Guide - Bare breasts and bottoms are "moderate," but full frontal nudity is "restricted."
https://help.yahoo.com/kb/flickr/safety-levels-flickr-sln110...
Safe - Content suitable for a global, public audience.
Moderate - If you're not sure whether your content is suitable for a global, public audience, but you don't think that it needs to be restricted.
Restricted - This is content you probably wouldn't show to your mother, and definitely shouldn't be seen by kids.
Guide - Bare breasts and bottoms are "moderate," but full frontal nudity is "restricted."