This story has been out there since day one.
This has also been discussed on previous threads by myself and others.
The story is, she was quite willing to have sex, but during the act Kobe rolled her over and anally penetrated her, despite her objections. This explains the "physical evidence". Even cosentual anal sex causes damage to tissue.
If that is true, then what in the world explains the fact that all her friends are saying that the evidence is "clearly visible??????????"