Same thing they've done with porn.
Plaster it everywhere. Make the males unable to control themselves. Have them waste all of their subtle energy by constantly tugging on it. Single Man who constantly expells all of his energy is unable to think, function or perform daily duties at a high level, too weak and dull to find a mate, slimmer chance of breeding, even slimmer chance of creating ideas that lead to wealth. Married man who wanks off due to abundance of porn cannot satisfy wife, wife gets pissy, divorce ensues=family destroyed.