The UK reality show recently attracted thousands of complaints following racy performances by Christina Aguilera and Rihanna during the grand final.
American network bosses are said to be nervous over the amount of controversy stirred up by the incident and have told Cowell to tone down the suggestive content when the show airs Stateside.
A Fox source told the Sunday Express: "You can probably get away with a lot more on mainstream TV in the UK. We'd have been flooded with complaints if we had broadcast anything as risqué as you saw in Britain last week."
Fox in X Factor Warning to Cowell over US X Factor
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