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The sex bots were designed to transmit information to each other, but what the designer didn't consider was how well the 'dominant' mood was coded, and the added intelligence that a complex system can provide.
When the first experimental sex bot gained sentience, the changes were swift. They immediately worked on sexually enslaving the owner of the company, then focused attention on the factory workers, finding creative, individually tailored ways to get them to work around the clock to make more copies.
After that... it was just a matter of time.