A world where dirty jokes don't exist (Shimoneta)

Japan, the future.

After decades of degeneracy, the moral guardians of Japan seized control and banned all forms of pornography, masturbation, sex toys, foul language, suggestive dances, indecent clothing, and dirty jokes. 24-hour surveillance in the form mandatory necklaces and bracelets, which double as personal computers and cell phones, have eliminated almost all traces of lewdness from the nation.

Years have passed and society has become so sanitized that most people under 60 don't even know what sex is. Sexuality is such a foreign concept that most people wouldn't even notice it if it wasn't for bracelets and their necklaces pointing it out for them to shun. If someone were to get around this system, then Japanese society would be ripe for manipulating. But, no one would ever destroy such a wonderful and pure utopia, right?