I’m gonna break something to you here that might blow your mind… Europeans (and the people in the article) do not go to a nude beach to fuck. They’re going there to feel more natural in nature.
Naked bodies are not sexual unless you sexualise them, which you are doing. The statue of David is a fine example here.
I honestly have never heard of a sexual nude beach in my life before. Maybe they exist where you live.
Edit:
EVERYTHING nude is sexual
If this is your world view I don’t think we’ll ever agree. That’s kinda messed up IMO.