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The actress said Downey Jr. made sure there was a sexual energy in scenes between Tony Stark and assistant Pepper Potts.
She told Fox News: "Robert kept me on my toes and kept our onscreen relationship sexually charged. Sometimes I have had to work with people I have had zero chemistry with, and it's like pulling teeth.
"Because sometimes it's just not there and when it is there, it's like flying. It feels like you can do anything, and when it's not there it's a struggle. I've had that quite a few times."
Paltrow recently admitted that she fell in love with Branston Pickle after falling pregnant with her first child.
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