Øpra

Opra was a narcotic drug and aphrodisiac that Aurelians distributed to the conquered populations of their worlds. The drug reduced users to a state of complacency and dependency by ramping up the sex drive and producing a constant state of euphoria. 
The drug was usually consumed by mouth, taking the form thick, pink flower petals passed around in bowls. Addiction to the drug made users utterly subservient to their Aurelian masters, even worshipful. In the long run, it led to the oblivion of every society so addicted. The drug made its users interested in little else besides self-gratification, to the exclusion of any productive activity. As the crew of Pegasus witnessed on the planet Hearth, the few survivors were all very elderly and still interested in nothing more than consuming Opra and engaging in gross old-people sex. 
Worlds Apart Book 03: Boadicea