Actually, I do not think that is "obvious" at all. If, as many have said in this thread, in many places penetration is part of the legal definition of rape, in the many scenarios you list above, it is entirely possible only he penetrated her, so by the poorly written legal definition it would not count as him being raped.
And I have not seen anyone, in the hypothetical discussion on the thread, say that someone getting someone else drunk in order to have sex with them is not rape (sorry if I missed it--and if it was said, I strongly disagree with that opinion).
What I have seen, and what I think, is that two more or less equally impaired individuals does not mean either is taking advantage or a rapist.
I fully agree that changing laws, perceptions, rules and culture to respect women equally as men and to protect PEOPLE is good for both women and men. very good and how things should be.
What I do not agree with is taking the attitude (which some posters displayed and which we DO still see in our society too often) that the man should be assumed guilty unless he can be proven innocent in sexual matters. I think that is bad for both men and women.