So it was a long time ago, but I reeber watching this weird animated movie. It was a futuristic film about two outlaws, (a beautiful woman, and a robot?) they are sent to the same prison where their bodies are bound in large sacks and fed through tubes. The end up having sex and the girl becomes pregnant. They then lead a riot with the other prisoners and break out of the prison
Maybe: Dead Leaves (2004) – http://www.imdb.com/title/tt0439533/
Here is a picture of them in the large sacks.
http://farm1.static.flickr.com/198/479403387_c0ef37a7d0.jpg