Okay, so nobody cared about sexbots banging each other while we
aren't watching.
Now, they've advanced beyond leaving little piles of batteries
behind:
http://www.scientificamerican.com/article.cfm?id=human-waste-powered-robot
'The first EcoBot (created in 2003) was powered by E. coli bacteria
feeding on refined sugar. Then "EcoBot-II" (2005) harnessed sludge
microbes to break down dead flies, prawn shells and rotten apples.
Finally, "EcoBot-III" (2010) showed how a "digesting" robot could also
dump its leftover waste, so that its microbes wouldn't be poisoned by
their own filth and could keep powering the robot.
'"EcoBot-III is a robot that collects its own food and water from
the environment," said Ioannis Ieropoulos, a roboticist at the Bristol
Robotics Laboratory (BRL). "It performs the task we design it to do,
and at the end of the day, it gets rid of its own waste. It literally
craps into its own 'litter' tray."'
Dr. Hot"soylent green is ROBOTS!"Salt