The Titanic actor, 45, stars opposite Ronan, 26, in the 19th-century period romance, which centres on the lesbian relationship between palaeontologist Mary Anning (Winslet) and geologist Charlotte Murchison (Ronan).
Discussing one of Ammonite’s most talked-about sex scenes, Winslet told Entertainment Weekly that she asked that the day of shooting be rescheduled to specifically coincide with Ronan’s birthday.
Some of Anning’s living relatives have disputed Lee’s portrayal of her relationship with Murchison, arguing that Anning’s sexuality was unconfirmed.
“I just wanted her to have, frankly, a great memory in her film life, regardless of how the scene played out or the movie turned out,” Winslet said.