updated 01/31/2012 AT 1:00 PM ET
•originally published 01/31/2012 AT 5:00 PM ET
“Channing got the props department to make a prosthetic, um, member,” the actress, 33, tells U.K magazine Stella of filming the upcoming movie’s nude scene.
“Literally a fake penis. I didn’t know what to do – I thought, ‘Is that the real deal?’ It was very realistic. It was ridiculous, the scale of it!”
Laid-back life in her home province of Ontario, where McAdams still resides, consists of considerably less shock and awe.
“I feel very much at home [in Toronto],” she explains. “I ride my bike everywhere. I have my favorite restaurants.”
“Michael and I never spend more than three weeks apart – we rack up a lot of air miles – but you have to be quite adaptable in this business whether you are in a relationship or not,” McAdams notes. “Trying to establish roots somewhere is a bit of a joke.”