The percentage of women who do not report rapes to police is high, over 50%, it's not upwards of 90%.
Reporting to police
Most rapes and sexual assaults were
not reported to the police (table 3).
Sixty-three percent of completed rapes,
65% of attempted rapes, and 74% of
completed and attempted sexual
assaults against females were not
reported to the police. (See box, page
3, for the most common reasons for
not reporting.) When the police were
notified about a rape or sexual assault,
the victim most often made the report.
See page two of the following Justice Department report.
http://www.ojp.usdoj.gov/bjs/pub/pdf/rsarp00.pdf
There is nothing more despicable on the face of the earth than a woman who would falsely accuse a man of rape.