SmileEachDay
Is "I thought she was 16" (12 year old,unable to consent) different to "I thought she consented" (drunk adult woman,unable to consent)?
In your case of too drunk to be able to consent, it's different.
I think a better analogy would be if she had taken a mind altering drug and could in no way give consent but to all intents and purposes seemed 'sober' to the person she had sex with.
If someone was drunk had sex they willingly participated in and then a third party said she was raped then the 'rasonableness' of her consent would be under question as well as the accused's belief (or otherwise) that she could give consent. If policemen and a taxi driver testimony and CCTV evidence all pointed to her sobriety then I'd imagine it would be unlikely to end in a conviction.
There are shades of grey in statutory rape as well as rape* cases and this is why judges have discretion.
By that, I don't mean 'no means no' is wrong, I mean situations like sober enough to participate but too drunk to 'give' consent.