Sorry but these guidelines are a change in the way the legal process operates. The onus will be on the man to explain himself in the police station well before it gets to court and a refusal to do so which he is perfectly entitled to is very likely to lead to a charge because he has not been wiling to explain how he got a positive 'yes' consent.
This is true of anyone charged or accused of any crime. Let's run through an alternative scenario:
Police: "Sir, you've been accused of breaking into the house over there and stealing the tv."
Person: "No no, that wasn't me. I was told by the homeowner I could take the tv."
Police: "Really? Right, can you give me some details - when and where did the homeowner suggest this? Did she offer you a time to collect the TV? Did you agree how you would remove it and when?"
At this point, the accused can go silent. Or he can state out that he arrived, as agreed, at 15:00 on Tuesday, was let into the house and removed the TV in his white van.
Assuming the accused is NOT innocent, he's going to be unlikely to provide any of this detail. In addition, the police will simultaneously be looking at other evidence eg history of the homeowner and the accused ever actually talking to each other, signs of breaking and entering etc. They'll then make a decision on whether or not to take the case further. It's not like they simply charge him and send him to court on a once off accusation by the person who originally owned the TV.
So why is it so difficult to accept similar guidelines for other crimes such as rape? This is not a change in how the process operates and under what conditions rape is considered rape. It's simply saying that the accused needs to at least attempt to explain himself.
And let's face it, if he says, "We got into bed, got naked and she kissed and cuddled me" the chances are that the police are going to say, "Okay then. this will be dropped." even if the woman says that she subsequently changed her mind as the police, even if they believe the woman, are going to find it very hard to prove that the man is lying.