"...nudity and sex scenes..."
Some leading stars are quite known for bedding their co-stars in virtually every film they star in. Polite company says they are “dating”.
There is a device, and I don’t remember the name of it, that is used by women on screen that blocks entry to her vagina during filmed perceived intercourse. Probably the most famous of these is the one Sharon Stone refused to use during her scenes with Michael Douglas in Basic Instinct. She admitted to not using it and said she trusted Douglas not to take advantage of the situation.
Additionally, what they are asking for is the return of the organization that used to monitor scenes for the movies, The Hays Commission.
http://www.artsreformation.com/a001/hays-code.html
rwood