temptress (plural temptresses) 1  An alluring woman who seduces or exploits men. 2  A woman considered sexually attractive by men. Marilyn Monroe, the iconic temptress of the 20th century.
Sarcasm is difficult to understand when crossing any language barrier, but yes it is a popular stereotype that the Germans have little sense of humour. I work with several german clients and they don't put up with anything let's put it that way. Just Google it.
Sarcasm is verbal irony, so it is not surprising that people confuse them frequently. Sarcasm is verbal; intonation and non-verbal expression help carry the meaning, and as such, it does not convey well on the Internet and other socially blind media (excepting of course, streaming video, etc).