Seems pretty straightforward to me. There are legal requirements for an action to be considered rape. -- In the first case, it really is quite trivial. Unconscious is not making a choice. Hence, "mentally competent". I suppose you could accidentally rape someone if you didn't know what rape meant, but if someone only told you "rape is sex without consent" and you fucked an unconscious person, surely if they took 2 seconds to think about it, they'd realize there is (and can be) no consent. I'm sure the people didn't really think it was perfectly fine to have sex with them. -- In the second case, it may be true that women have a more difficult time saying "no", but that doesn't absolve them of responsibility. Perhaps it is a failing that more women have sex when they don't really want to (but never express it), but legally, it would not be rape, so I don't see why this is being brought up. I agree that this scenario is unfortunate and but it doesn't warrant locking up a person. Yes, we should all strive to be sensitive to the needs of our partners, but realistically, some girls even feign consent when they really mean "I don't care much for it" or "if you'll cheer up afterwards" or "if you'll like me more" -- i.e. disinterest or questionable motives.

In summary, let's keep rape as a reserved term for obvious and gratuitous violations. This "accidentally raped" is kind of stupid.