I have no idea what they are expecting people to do to confirm consent. Breathalyser tests and a signed document in the presence of a lawyer?
The problem with rape cases is that it really is impossible to find out what the truth is. Because false accusation can absolutely destroy someone, people are (rightfully) not quick to condemn someone. Even the accusation, without conviction, can ruin someone's life. However, rape can also ruin the victim's life (as Redemption? says, the impact can be severe psychologically), and most cases rarely come to anything. I'd imagine there are many more cases of victims (male or female) going unnoticed than of false accusations, but both are left vulnerable.
This legislation obviously makes no sense, but it seems like no matter what you legislate, there's little protection for either side.