The law, signed by strongman President Gubanguly Berdymukhamedov over the weekend according to state newspaper Neutral Turkmenistan, cites "protection of minors" as the reason for the ban on erotic content.
While the legislation does not specify what "bad habits" broadcasters should avoid promoting, Berdymukhamedov's government has waged a war on smoking in the republic of five million.
The document equally does not explain how content will be judged "pornographic" or "sexual-erotic".
The new law also says broadcasters must aim "to create TV and radio programmes (showing) a positive image of Turkmenistan."
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Press freedom watchdog Reporters Without Borders says Turkmenistan suffers from an "ever-growing information 'Black Hole'" and placed the ex-Soviet republic 178th out of 180 countries in its latest press freedom index.
Citizens have traditionally turned to satellite television to bypass state information controls, but rights groups claim the government has been clamping down on people using dishes in recent years.
Former dentist Berdymukhamedov has become the subject of a growing personality cult since taking over after the death of eccentric former leader Saparmurat Niyazov in 2006.
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