Answer:
   
   While there may be a few token women who fit the stereotype, it's a
   cruel slur frequently directed at Jewish women in general, and not
   always by Jews. (see William Styron's Sophie's Choice, especially
   chapter 7, for some very offensive Jewish portrayals, including the
   JAP.)
   
   The most common use of the slur "JAP" is by Jewish men who rationalize
   their habit of dating gentile women by slandering the Jewish women
   whom they could be dating. Many who use the term are unaware of its
   offensive nature, so if someone uses it innocently, politely ask them
   not to use the term.