No Filter: These Actors Were Really Getting Intimate On Film!
Lust, Caution (2007)

Famed director Ang Lee (Brokeback Mountain) created this World War II era film about a woman named Wang Jiazhi, who becomes caught up in a dangerous game of emotional intrigue with a political figure. Lust, Caution was based on a 1979 novella by Eileen Chang.
Rumors about unsimulated scenes quickly spread. The scenes allegedly included interactions between actor Tony Leung Chiu Wai and his co-star Tang Wei. The movie was promptly given an NC-17 rating in the United States. Lee won the Golden Lion Award at the Venice Film Festival for Lust, Caution. Lee had previously won that same award for Brokeback Mountain.