Producers of new historical Tv drama Reign have toned down an explosive 16th century masturbation scene for fear they'll upset U.S. censors.

The pilot for the new show, which debuts on America's Cw channel this week (beg14Oct13), originally featured a graphic scene in which an aroused handmaiden, played by Caitlin Stasey, pleasures herself on a castle stairwell after watching two newlyweds make love.

She is interrupted by the King of France, portrayed by Alan van Sprang, who offers full-on sex.

The saucy scene will remain but the more risque footage has been cut.

Reign stars Adelaide Kane as the Queen of Scotland.