Really? Then why is there a "necessity" for the morning after pill if people were to believe the effrective of what you state? I know how and what corisol is and sorry- it is not going to prevent pregnancy at the rate of effectiveness you claim. From the NIH:
Abstract: Pregnancy following rape is a continuing and significant public health issue. We estimate that the 333,000 sexual assaults and rapes reported in 1998, along with many more unreported, were responsible for 25,000 pregnancies. Potentially, as many as 22,000 such pregnancies could be prevented if all women who were raped received prompt medical services, and if not already protected against pregnancy, were provided with emergency contraceptive treatment.