Nude picture of a girl's butt is seen. Later is revealed that its taken from elbow.

In the first season, three boys are seen reading their school book that has picture of hand-drawed naked man and woman. Doesn't look realistic at all. The boys talk about the pictures.

Students use a photocopier to print pictures of their butts on paper.

A teenager is seen with a bloody wound in his face.

Teenagers are seen hitting each others balls with a baseball bat. Then everyone falls down and starts moaning in pain.

Fistfights and punching in comedic context.

Lots of swearing throughout the series.

A full f-word is heard only once in the last episode of the last season (in finnish). There is a lot of other swearing.

In season 1 episode 2, three teenagers are seen smoking for about 3 seconds.

In season 6 episode 6, three girls are seen using electronic cigarette very clearly.

None.

Some emotional moments especially in the later seasons.

The first seasons are more comedic, but in the later seasons the series starts to be more dramatic.