Olivia Munn is every fanboy's dream.

During San Diego Comic-Con Saturday, the actress and five of her X-Men: Apocalypse co-stars—Michael Fassbender, Nicholas Hoult, Oscar Isaac, James McAvoy and Evan Peters—appeared on TBS' Conan. In the movie, Munn plays psychic ninja Betsy Braddock, a.k.a. Psylocke. The comic book character wears a very risqué costume, and Munn will be wearing the same costume onscreen.

The only difference between fantasy and reality is the size of Munn's boobs. "I come in through the deficit with that part. But the costume is exactly like that, just a lot less here and here," she said, pointing to her breasts. "I'm sorry."

"There's a lot of lubrication involved in getting you into the costume," McAvoy said. Munn laughed and replied, "That is true, James, and thank you for knowing that."

"Someone needs to help," McAvoy added.

"They lube me down and I step into this latex [costume]," the actress said of what it takes to get into character as Psylocke. "We did a whole latex fitting."

"All right," Hoult joked. "Now we're talking."

"They lubricate the costume and they lubricate me," Munn continued.

It's not an easy costume to wear, either. "The first day I put on the latex suit, I was out there and I was really excited to be with these guys. I met Michael and James everybody, and I was just so excited. I was like, 'OK, I wanna do like a really good job,' and I just popped the crotch," she recalled. "The latex just broke."

"Crotch-popping can be a super power," Andy Richter joked.

Wardrobe issues aside, there are other things to worry about on set. One concern is the use of BB guns. "I shot him in the ass," Hoult said of Josh Helman, who plays Bill Stryker. According to Fassbender, who has been a target of Hoult's attacks, it could be worse. "It's a good place," he said. "There's lots of flesh."

Still, the cast has cut back on the use of BB guns since filming X-Men: Days of Future Past. "One of the costume ladies complained that she felt unsafe at work, so we had to down our weapons," McAvoy said.

They later created the punching game, which evolved into the slapping game—and it involves alcohol. "It's quaint that you're calling it 'a game,'" Conan O'Brien said.

Watch the actors demonstrate how the games work in the video above.

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