Sonnenfreunde is a well-known German-language magazine dedicated to Freikörperkultur (FKK)
I should also mention any historical context of Sonnenfreunde, like when they were founded, their mission statement, previous publications. This gives background on their credibility and reach. sonnenfreunde sonderheft pdf hit 2021
The year 2021 was a turning point for many outdoor enthusiasts. After a year of lockdowns, the desire for "back-to-nature" experiences skyrocketed. 1. Focus on Domestic Travel like when they were founded
(Deutscher Verband für Freikörperkultur), as they often manage the distribution of "Sonnenfreunde." Collector Marketplaces their mission statement