He forced them to perform pornographic acts which he uploaded on the Internet and charged fees for viewing. Occasionally, he loaned them out as prostitutes, the court said yesterday.
Li also forced and instructed one of his sex slaves, a woman surnamed Duan, to help him kill another woman in 2010.
Li, with Duan's help, beat the victim to death in front of others to force them to "obey."
He buried the body close to where they slept as a warning.
Then next year, Li asked Duan and two others surnamed Jiang and Zhang to kill another woman.
It was previously reported in the Chinese media that the woman was killed and buried after a fight over who would sleep with Li, but the court did not announce the reason why Li murdered her.
All the three women were found guilty of murder but they were shown leniency in their sentences for committing crimes under threat, the court said.
Li was caught in September last year when one of the women managed to escape after she had been forced to go on the street to earn money as a prostitute but went to the police instead.
Li went to his sister's place to borrow money with the intention of fleeing the city but police caught up with him before that.
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