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The actor told Entertainment Weekly that the upcoming sequel features a heated love triangle between his character Tony Stark, Gwyneth Paltrow's Pepper Potts and Scarlett Johansson's new addition the Black Widow.
"Our signature as a superhero franchise is that we're horny," Downey Jr said. "Not, like, can't-bring-your-kids horny, but just... horny."
Paltrow added that the battles for Stark's affections are more complex than a "male catfight fantasy".
"The men want it to be, like, 'Ooh, the girls are fighting over Tony', but it's not as standard as that," she noted.
Iron Man 2 is scheduled to open in cinemas on May 7, 2010.
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