Well, the majority of celebrities prefer to do nude scenes in reality. Body doubles are rarely used these days as producers prefer to keep things as original as possible these days. These celebs nude videos bring tons of viewers as the demand of the public for erotic things have increased to a pretty larger level. However, still you will find many stars who deny doing such scenes.
In that case, you will see body doubles where various camera angles are used to make things as real as possible. It becomes harder for the public to find out whether it is the nipple and butt of their favorite actress or not.
