Florence Pugh says naked scenes were banned from "The Little Drummer Girl".
The new BBC One spy thriller - which sees the 22-year-old actress star opposite Alexander Starsgard - won't be as racy as some of the channel's other dramas, including "The Night Manager" and "The Bodyguard", because of its US audience.
She told Radio Times magazine: "America is quite scared of bums and nipples. We had to make sure there were no bums and nipples out. I don't know why. Such strange people."
Florence admitted it caused some issues during filming, particularly during one scene in which the two stars were "under the duvet".
She explained: "There was one scene we did where Alex and I were under the duvet and supposedly naked. I was wriggling down one end and Alex is wriggling down the other.
"Halfway through, I hear: "Cut! Cut!" Director Park says, "Florence, you've got to hide your nipples more!" I'm like, "OK!"
"So we do it again, and again I hear: "Cut! Cut! Florence - it looks like you're hiding your nipples." I'm like, "Arrrgh! Just let me get my breasts out, I don't care!" But America does care."
The star was brought up watching "lots of European films", and she has never seen nudity as something to be ashamed of.
She added: "My parents were very cool and made sure we watched lots of European films when we grew up, so nudity has never been a problem for me, as long as it's done beautifully.
"There's a reason why there's a problem with bodies and it's because you never actually get to see any normal versions of them."