Los Angeles - Lupita Nyong'o would never gain 45kgs for a role.
The 33-year-old actress and her Queen of Katwe co-star David Oyelowo - who piled on 13kgs to play Martin Luther King Jr. in Selma - played a game of 'Dwheel Breakers! Career Edition' during an appearance on 'Watch What Happens Live' and revealed what they would and wouldn't do for their art.
Asked about the huge weight gain, Lupita said: "I've battled with this one, I have, but I don't think so."
David added: "I gained 30lbs to play Dr. King. I don't think I want to do triple that."
The 33-year-old actress said lots of S&M action would be acceptable - but only if she was "the dominator".
However, David would refuse for the sake of his family life with wife Jessica.
He told host Andy Cohen: "I have four children, so no."
Both stars would work on a location without mobile phone reception for a year, but not in a cold place.
Lupita noted: "That would be quite fabulous actually."
And neither Lupita nor David would exchange a big pay cheque for a bad script.
The actor said: "That is the way to kill your career."
But both would accept stage roles as an 'adult baby'.
David said: "That sounds fun."
Watch Lupita and David play a game on the show here: