In South Africa-A student is charged with the alleged rape of a fellow student. During the trial, the victim testifies that the rape took place one night after a function on a deserted part of the campus. She explains that she was involved in a serious battle with her assailant and identifies the accused as her attacker. During cross-examination it is put to her that she is lying, because she couldn't have observed the assailant's identity properly. The accused also cross-examines her about her sexual relations with various other men and indicates that he intends calling witnesses in this regard. The prosecutor responds by calling the complainant's friend who testifies that the complainant had given her a similar version of the events that very same night. She also testifies to what the complainant had said about the identity of her assailant.

1. Because of the nature of the crime, the complainant's friend could testify as an exception. However, before this exception can apply, certain requirements must be satisfied. Fully discuss the exception and requirements with reference to decided cases.