Look if a woman is too drunk to consent to sex, then technically it is rape, there is no question about that, why is it so difficult for people to get that through their heads? However, in the real world, as Diamondback says, nobody in those circumstances ever goes to the police about it anyway, because they know there is no point and for the most part, they blame themselves for being drunk, becuase rape victims are as vulnerable to rape myths as everyone else.
I totally agree with Diamondback's earlier post about how men are more likely to call rape when they see it, because they don't make excuses for men to the same extent and that's because they're not threatened by rapists. For most women, the thought that the nice looking bloke in the dock who they might actually fancy, is a rapist, is a horrifying thought - if he is, then who can you trust not to rape you?
That's why some people are so insistent that rapists are monsters, they look different from other men, they are wierd, they exude an air, your sixth sense would kick in, if you're not drunk you'll be able to somehow tell that this man is a predator -because the thought that actually, none of that is true, any bloke who you are friendly with, who might be your neighbour, your colleague, your friend's husband, could rape you and there is fucking nothing you could do about it, because if you complain, he will deny it and everyone will think you consented, is absolutely fucking horrifying. It is so much easier to believe that the woman in the witness box is a loon, even if she has no history of being a loon and doesn't look like one, or that if only you don't get drunk, it won't happen to you.
It can happen to anyone. 1 in 4 of us suffer rape or sexual assault and most of us won't bother reporting it when it happens to us because we know there is no justice. It is very very hard to face that, so I do understand why some women want to avoid it.