That is it. There are no neat little boxes. It is down to human variation and combinations of circumstances, to men who want to dominate, men who listen to women and men who don't, men who believe all that crap about women really being all for it but just protesting for the sake of apperarances, men who drink until they reveal their inner selfish nature, men who think that they married partly to have sex whenever they feel like it, women who want to enjoy an evening out, women who drink a lot, women who don't drink a lot and believe that they are therefore safe, women for whom an evening in means a nice meal and watching a video or two while snuggling up on the sofa with a drink, not rampant sex on a scratchy carpet, women who don't fancy it tonight but go along with a demanding man. Add to that women who are all for it, do fancy it tonight, but not with the particular man they seem to have been lumbered with, or in the uncomfortable circumstances where he has chosen to make his move, and you are in - it has been said before - a minefield.
To go back to the OP - no, a drunk woman is not capable of saying "yes" and meaning it. Having a few drinks, enough to make her cheerful, may not cloud her judgment, or affect her memory of what she said, but being stocious certainly will.