Speaking at WonderCon, the helmer said that he will not remove a shot of actress Moon Bloodgood topless in the rain for the benefit of securing the movie a lower rating from the MPAA.
He said: "I didn't want to [make choices based on a rating]. We would never do that. Now having said that, should the film be PG-13? The Dark Knight is PG-13 and I would regard that as made without compromise."
Discussing the nudity further, he added: "It wasn't a function of the rating. It was a function of whether it's gratuitous or is it servicing the story? Sometimes, you want to say that the softness of the human flesh is one of the things we're fighting for. It's decidedly human and it's not like the machines. Or does it just feel like a juvenile moment in an otherwise very serious film?"
Bloodgood insisted that she is in favour of the scene because it is not "shallow".
"I fight so much against nudity, but I'm a woman, I have boobs, it's a beautiful shot," she explained. "It wasn't at all gratuitous. I'm not afraid to say 'no'. I would have said, 'No, I'm not doing it', and I've done that, but it was beautiful. Did you ever just want to get naked and connect to someone?"
Terminator fans have called for the new movie, released on June 5, to be rated R, keeping it in line with the rest of the franchise. However, McG has previously speculated that it may receive a PG-13 classification.