He tells New York Magazine, "(Vaughn) goes, 'Eh... let's have you dress as a prostitute.' And I'm like, 'I play Professor X'. (It's) weird, weird s**t. It's not like dangerous filmmaking or anything, but it's fun, it's irreverent, and it's not what you'd expect... You have to commit, to try and believe it even more, maybe because it's so ridiculous."
But McAvoy insists the superhero mutant movie will be worth the wait. The Scottish star recently admitted he and co-star Michael Fassbender had their reservations about the final cut of the film, but were relieved when they realised it was actually good.
He told WENN, "I phoned Michael within a half hour (of seeing it) saying, 'Dude, you've got to see this movie really quick because you're gonna be relieved...'
"We were worried because sometimes these things are a nightmare to make and it's well documented so there's no point in hiding out but it turned out really good. I think we always thought it could either be really different and really brilliant or really bad and really different."