In a fab montage, the pair go on a recruiting drive, in which they perch on a strip-club bed.
"That scene got exceptionally silly at one point," says McAvoy. "I don't know if I'm even allowed to tell you what originally happened. But it got pretty f---in' kinky. I'm not joking."
Was the dashing duo's bromance, uh, consummated?
"Unfortunately no. But there was a little bit of cross-dressing going on. That's all you need to know."
(For the record, McAvoy would have preferred it if Xavier and Magneto stayed together. Like, really together. "It is a little bit of a mini-tragedy that him and Magneto don't, you know, have sex and become married and become best friends.")