In 1981, director Gerald Potterton, producers Ivan Reitman and Leonard Mogel, along with a murderers' row of animators and voice actors, came together to make the adult animation anthology sci-fi/fantasy film Heavy Metal. Many of the short films were based on stories published in Heavy Metal magazine, and animated in various different ways by a number of different studios. It all came together to build a wild and imaginative view of the future, the past, and far-off planets, and swiftly became a cult classic for anyone interested in the art of animation, the art of creating fantastical worlds, and the art of, uhh, alien sex.
Because Heavy Metal and its 2000 sequel are considered "adult animation," they're allowed to put in things like boobs and blood and guns -- and plenty of it. In one memorable sequence from Heavy Metal's segment "Taarna," a mute warrior woman dressed in what's basically bondage gear arrives on the back of a giant bird and brawls with a bevy of barbarian soldiers, slicing their heads off with a swing of her sword. In another, from "So Beautiful and So Dangerous," a buxom Pentagon stenographer is abducted by a starship and convinced to have sex with a robot.