Theoretically, the idea is that you cannot give consent if mentally you are, well, not able to give consent. I'm pretty much in agreement on that aspect of their law, as long as it's not worded poorly so that the innocent regularly get convicted. There should be a psychiatric expert on hand to give consultation in laws like this, and I know Finland has that for its entertainment rating committee (a group made up of child psychology experts).
Anyways, it seems like they are trying to legislate on the topic of "uniformed consent" and...uh...what's the phrase? Like, being too drunk to consent or mentally unstable or socially unstable or whatnot.