Theere are mild innuendos found throughout the show, but no nudity is ever shown and sex is never referred to once. Examples of the innuendos include things like the primary male protagonist making comments (solely through his mindset) about the female protagonist's breasts, noticing the tank-top under her uniform, and mistakenly looking under her skirt (though only shorts are shown). However, nothing is ever explicit in nature and typical for a middle school environment.

Season 1 has a scene where the female protagonist pulls up a picture from the male protagnist's phone of a women in a bikini. Cleavage is shown in the picture. This is a brief scene.

Season 2 has a scene where a little girl is dreaming about what she will look like when she grows up. In her imagination, we see her as an adult dressed in a revealing bikini showing cleveage. The scene lingers a little longer than some younger viewers may be comfortable with.

None. Only less violent threats were mentioned in the show.

There is occasional sightings of the sentence 'damn you, takagi-san!'

In one episode one of the main characters imagines himself as Sherlock Holms and is seen smoking a pipe.

none sorry