@enripa : nice set of rules ... about the same ones I stick too.
Maybe to add a few :
- try to go with your partner or some friends. Single guys sometimes are frowned upon.
- Make sure, amongst people you would like to see naked, they know you go to nude sauna centers. Chances are they might be interested too and join you. Worked for my wife's sister and her husband
... also worked for a hot friend of my wife, but so far she will only go when no familiar guys (unfortunately that means me) are going also.