Back when I was married, my wife had sex with me one night....while I was asleep! I mean, I was totally out of it. To this day, I have no memories of it. Obviously, I did not give any consent to having sex, as I was asleep the entire time.
I'm not trying to make light of the concept of male rape, but merely point out that, from my own personal experience, yes, your body can be manipulated into intercourse without you "being into it" or "wanting it". Even thou she was my wife, I was a bit pissed, as she thought it was a humorous situation.
Not to sure she would have seen the humor if the situation had been reversed.