The 35-year-old actress stars alongside fellow Australian Jacob Elordi in the Emerald Fennell-directed movie, which is loosely inspired by Emily Bronte's 1847 novel of the same name, and Robbie feels fortunate to have worked on the "most amazing screenplay".
"The chemistry between us as Cathy and Heathcliff … We were so set up for success, to be honest," the Hollywood star told Extra.
"Like, we had the most amazing screenplay and we had the most incredible designers designing these shots and these sets and these costumes, and you have Emerald there who's so attuned to what can make someone go and gasp and, you know, it's like we were just given all the ingredients to do something amazing, and all we really needed to do was bring our best as well."
Robbie also felt comfortable with Jacob, 28, when they filmed sex scenes together.
"I never felt like I needed to be careful with him and he, I think, he didn't feel like he had to be careful with me," she said.
"I think we quickly got to a place where it's like try anything, do anything. You're not going to, you know, hurt me."
Earlier this year, Robbie admitted that she relished the emotional "swings" of Wuthering Heights.
She was asked if the film's romantic scenes demanded a different kind of preparation.
"No different to all the other scenes that we do. The movie kind of demands a lot of all of us," she told People.
"My character essentially cries in every single scene, but no, it was a joy. I loved playing a character who kind of swings from one wild emotion to the other in an instant."
The movie is written and directed by Emerald, and the 40-year-old filmmaker stressed that "safety and trust and love" were uppermost in her mind when she helmed the sex scenes.
Emerald - who directed Elordi in 2023's Saltburn said ,"it's always just about making sure everyone feels super comfortable and we all are, really".
"We trust each other and so we try to kind of make it funny and laugh everything off.
"But love scenes are just the same as any other scene, really. And so we just approach it from an emotional point of view."
The director also revealed that she relished the experience of working with Robbie.
"She's an inspiration. She's an extraordinary woman," she said.
"She's a mother, she's a producer, she's an unbelievably talented actress and she also always has time to be generous to the people around her. And so she's the best."
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