Jane Fonda as Barbarella

Barbarella is famous for a sequence in which the title character, played by Jane Fonda, undresses in zero gravity during the opening credits.
The whole film is played in a tongue-in-cheek manner—especially when it comes to the frequent (but non-explicit) sex scenes. The most controversial of those scenes involves Barbarella being "tortured" by use of a machine that gives sexual pleasure in doses that can be lethal.