They know that during the rape, the rapist had the power to do anything to them, including take their lives. And there are no guarantees. Some women have been brutalized even though they submitted. There are no rules on how to survive a sexual assault. Some people believe that rape results from an uncontrollable sexual urge, that men rape impulsively and out of biological need.
Rape is a criminal act of violence using sex as a weapon.
Men rape to express hostility and to dominate. They rape because it allows them to express anger and to feel powerful by controlling another person. Additionally, most convicted rapists are married or have available sex partners, which supports rape being a learned, planned behavior that does not arise from impulsive biological need. Many people, men in particular, do not understand the dynamics of rape. If you have any doubt, just ask a few men when was the last time they had fears of being raped and how they would feel if they were raped.