Amy Adams has revealed that her kiss with Jennifer Lawrence in American Hustle wasn't about love, but dominance.
The actresses had to lock lips in David O Russell's drama, which is based around the FBI Abscam operation of the late 1970s.
"It's sort of like a confessional and a power struggle and [our characters] are both so desperate and so angry... and I said, 'Well, what if [my character] kisses her because that's the ultimate chess move'," the actress told Access Hollywood.
Jennifer, who plays Rosalyn Rosenfeld in the film, said the snog, which wasn't in the script, was all Amy's idea.
"That was her idea. David brought it up to me and was like, 'Amy thinks that you should kiss her in a scene,' and I was like, 'What? Why?' I didn't understand it," the 23-year-old explained.
"When we started the scene... it completely made sense. Rosalyn has a toxic need to be in control and to overpower a situation. I did not think it made sense before David called action and then as soon as we were in the scene, it happened organically because it was just so true."
She continued: "Anybody can slap her, anybody can just storm out, but I am going to horrify her and scare her and alpha her [and] cover her in lip gloss."
Amy had praise for her snogging partner, saying: "She killed it. It didn't feel sexy, it felt toxic... I did not kiss her back. There's no like participatory element to it at all there."
Christian Bale, Bradley Cooper and Jeremy Renner also star in American Hustle, which is released at the Vue West End on December 20 and will be on general release on January 1, 2014.