But there is absolutely no motive for Richardson to have lied. The incident was reported in the British press not long after it happened, over three ago before Schwarzenegger was a blip on the poltical radar screen. Richardson has never backed down from her description of the incident.
In real life, most women who are unexpectedly sexually assaulted--especially by a powerful male figure such as a boss or a Schwarzenegger--are too stunned and confused by the suddenness of it to react that way. They try to find an exit, but not much else.
That's why gropers such as Clinton and Schwarzenegger get away with it for as long as they do.