France's broadcast watchdog says TV channels should only show Miley's video for Wrecking Ball and Britney's video for Work Bitch after 10pm, when French broadcasters show a range of programming more suited to adults.
The watchdog, CSA, said in a statement some channels were showing them in the daytime and without parental guidance warnings.
Miley writhing naked around a wrecking ball is too sexually explicit, it says.
And Britney, with her bondage gear, shows "a sadomasochistic universe representing women in a way that risks shocking many viewers".
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