Allowing yourself to be undressed and had sex with while you are alone with a woman, not tied up, with security outside the door, and loads of people outside, because you didn't want to take a bag off your head, or talk, in the name of art, is not rape.
Would he have stayed quiet if she started to cut his dick off?
Would he have stayed quiet if it was a guy in there genuinely raping him?
Then he acts all suprised when his girlfriend is upset.
Yeah, no shit!