Rapists are also motivated by character traits common to many criminals. One study on women raped or sexually assaulted during 2002 found that 67 per cent of the women identified the perpetrator as a non-stranger.25 Another study found that 8 out of 10 victims know the people who raped them.26 Most victims do not incur physical injuries from sexual assaults. Many of the unwanted and forced acts that take place during a sexual assault do not result in visible nongenital injuries. When humans are threatened, they respond, initially at least, instinctively and rcflexively.