Not that I don't like it, is that when it adult swim didn't air it anymore, I didn't catch up to it. XD
Saber Marionette is about a planet that only men exists through cloning, no women because they went extinct. To make that problem go away, they made androids in the form of women and they're called Marionettes. Saber ones are the ones that can fight. Anyway, even with the marionettes, the problem of reproducing as nature intended still haven't go away. So two men created three marionettes each with a programmed heart called the master circuit or virgin circuit (don't know if the name is right, I got it off the Latin Spanish version of the anime. xD) that makes them feel, think and act as a normal human. Since normal marionettes can't do that. With that, only three of the six mature and can help bring back the last woman back to earth.