'Shimoneta' is set in a near future where everything even vaguely sexual has been outlawed. The protagonist is roped into the "erotic terrorist" group SOX, trying to educate their high school in all things carnal by spreading dirty pictures.
While amusing for a few episodes, the dirty humor soon becomes grating, devolving from fairly clever innuendo into the secondary protagonist yelling vulgar words at opportune moments. Similarly, the reasonably fun slice-of-life approach suddenly turns into an over the top action-based mess where a panty-obsessed fetishist commits mild but genuine terrorism. There's also a non-con subplot of the female-love-interest-turned-creepy-stalker forcing herself onto the protagonist, because the writers thought that's funny I guess.
Issues with the story aside, the characters are fleshed out fairly well, the animation is good, the soundtrack does its job, and even the English dub is solid.
All in all, 'Shimoneta' is light-hearted fun, primarily targeted at male teenagers who think that yelling genital-related words is funny. I found a bit of a slog after the first few episodes, but it was amusing enough.