What FKK means?
Naturist beaches are marked with signs saying “FKK” for “Freikorperkultur,” German for Free Body Culture Nudism, or naturism, is the practice of going nude or unclothed in social and usually mixed gender groups, specifically in cultures where this is not the norm. It sometimes occurs furtively in secluded places in countries where appearing naked in public is illegal, but enjoys widespread acceptance in other areas of the world. Those who practice nudism are called nudists or naturists. … en.wikipedia.