Strange being that Men don't yet (and probably never will) understand. Can be subdivided into various groups, including:
Interestingly the only question that the great Chinese philosopher and wise guy Confucius couldn't answer was one posed by a disciple who asked;
'"Master. What do women want?"
The great man stroked his beard for a few hours and replied
'"Fcuked if I know mate".....in Chinese.
Also see women