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one would never find any discussion or questions
on German forums on that topic and one can get no information
about it in any prospects.
So I think the only real posibility for nudists are AIDA ships
The only "problem": people would laught if one cary a hat or cap
in Sauna as I did (I like only to protect my "brain" from hight temperature),
I did it as i know the people from Finland use to do it-and it helps!