Security video outside nightclub clears USC student of rape - CBS News
There have been several cases like this one, of men who were charged with rape who were exonerated by video that showed the women gave enthusiastic consent by every objective measure. This does not mean the women were liars—there's no reason to assume they did not honestly remember what they said they forgot.
But it does mean "believe the victim" is a bad principle. The better one is "investigate every charge."