"If a woman is so drunk she cannot recall anything, it is assumed she cannot give consent to sex and a man can be charged with rape."
The law presumes no consent until proven otherwise, (which seems tantamount to guilty until proven innocent), but it's framed in terms of what the defendant reasonably believed immediately before the sex, not what can be recalled after the event:
"the complainant is to be taken not to have consented to the relevant act unless sufficient evidence is adduced to raise an issue as to whether he consented, and the defendant is to be taken not to have reasonably believed that the complainant consented unless sufficient evidence is adduced to raise an issue as to whether he reasonably believed it."
The law says there's no consent if:
"the complainant was asleep or otherwise unconscious at the time of the relevant act"
or if:
"because of the complainant's physical disability, the complainant would not have been able at the time of the relevant act to communicate to the defendant whether the complainant consented"
which doesn't address the question of how drunk either.
"Consent cannot be assumed."
Consent is almost always implicit rather than explicit, and with good reason it seems. We have to start from the premise that a woman has an absolute right to withdraw consent at any time, so it follows that either she has a responsibility to communicate when she is withdrawing consent, or the man has a responsibility to continually ask her: Do I have consent? Do I have consent? Do I have consent? Clearly the former is more reasonable than the latter.
However, it seems to me that a man knows full well when a woman is responding positively to his advances, and if she isn't then it's unwise to assume consent, and that's a cue to ask her. If a woman can respond positively, or answer a question then she has to take some responsibility if she can't remember what happened later.
A jury reaches a verdict based on what the witnesses say happened, not what actually happened, so I wonder whether the difficulty of telling the drunkenness of someone is any more of an obstruction to justice than the difficulty in establishing the truth more generally.
I must have spent hours drafting then deleting posts for this thread, on the one hand I have had a girlfriend who had been raped (by her ex-husband), and on the other I have had others who seemed to be seriously pushing their luck. It's so difficult. I do wonder just how far some women would go before they regard their behaviour as risky, though.