Saunas, a minority of swimming pools and even some public parks on sunny days are considered to be "textile free," at least at particular times.Getting together completely naked in a sauna, however, has no sexual dimension to it whatsoever.Likewise a closed bathroom door in somebody’s house does not mean the bathroom is occupied. When answering the phone in Germany, it is common to identify yourself with your last name.Telephoning: Don’t call people at home after 10 p.m. Don’t expect to reach anyone in the office after 5 p.m. Fräulein: Forget this outdated form of addressing young women.Drinking: Beer and wine are part of a normal dinner and alcoholic drinks are usually offered to guests. Do not insist on alcoholic drinks if a person has rejected your initial offer and don’t order them for them.
If you’re not on a first-name basis in German, you can still switch when speaking English. Titles: Titles of nobility belong to an individual’s name–such as Fürstin von Metternich. Academic titles also belong to the name, such as Herr Doktor Müller or Frau Professor Weise.
(In return, they’ll give you presents.) It is also common to bring some cake for your colleagues on your birthday. They may thus often close their doors but will be happy to receive you if you knock on the door.