They are not conditioned to flirt with women randomly and tend to be quite rigid.
In most cases, they come from a rigid background in which not only have they been terrorized by other children in school but also by adults.
For Germans there is a way of life and people pretty much know what to expect.
If you are an American woman who has set her sights on a German man then there are a few things you will need to know.
It seems to me that dating a German guy is a complicated and long process as is memorizing the word "Geschlechtsverkehr", which basically means "sex".
For this reason dating German men can be somewhat of a challenge for a woman who is not accustomed to the customs of German people.
In reality, the above is a conception based on experience as an outsider.
Germans are typically perfectionists and seem to expect this from everyone they come in contact with.
Further, if you do something wrong or not by their standards they normally have no problem ridiculing you and telling you what an idiot you are.