I'd also add that in accepting that many of these cases will never result in a conviction due to insufficient evidence, we need to ensure that those cases that DO result in a conviction result in strong enough sentences to act as a deterrent. 

As it stands now, too many rapists are given slaps on the wrist the rare times they are even convicted. A 6 month to 3 year sentence is a slap in the face of victims who have to live the rest of their lives dealing with their pain, and does not send a strong enough message to would-be rapists that this is a serious crime with serious consequences.