In one episode, Will attempts to have intercourse with a girl but ends up awkwardly doing it completely wrong. No genitals can be seen.

In one episode, Simon and Jay change Will's facebook profile picture to a naked man. You can see a fair bit of detail however it is quick and easy to miss

Two of the characters notice that Simon's "got a boner."

Simon gets a handjob from a girl but he is clothed and not especially graphic, though we do see his pleasured facial expressions.

Constant crude sexual references throughout, although they are all funny and not meant to be taken seriously. The show frequently implies that a sex scene will happen but it is always narrowly avoided in some way, most notably when Simon attempts to have sex with his girlfriend but can't "get hard" so never does.

Constant crude sex references throughout the series. And a lot of different anatomical terms.

There is some brief nudity (full male rear nakedness) in a couple of episodes.

It is comically implied that one of the teachers is a pedophile.

A group of boys watch porn on their phone. Only their disgusted faces are shown.

Jay is caught masturbation although nothing is seen.

Simon pukes on Carli's kitchen counter and then on her brothers face from drinking too much.

Season 3 contains subjects related to animal death and animal abuse.

A lot of threats, mostly from the school bully.

Will accidentally hits a disabled girl in a wheelchair with a Frisbee.

Neil punches a fish to death. A little bloody, not particularly pleasant.

All uses of "Fuck" are bleeped on US broadcasts.

Very graphic sex reference.

Excessive usage of "fuck", "shit", "wanker", "twat", among other words. One use of "Cunt". Some usage of sexual slurs. Some uses of "retarded".

Mild language is also used.

Some strong sex references and anatomical terms, including 'dick', 'pussy', 'cock', 'gay', 'homo', 'bent', and 'bummer'. Also a mix between the two words 'bummer' and 'bender' is used being said as 'bumder'.

Infrequent drug use, alcohol consumption, and smoking.

Several episodes include underage drinking, and the boys attempting to purchase alcohol with intent of getting drunk. They are never able to buy any, except one episode, although they immediately suffer repercussions for this.

In one episode in season 3 the characters get high. 4 characters from marijuana, and one from sleeping pills combined with cough syrup and alcohol.

Dark comedy is present at times in the show

There are a specific scene where a character intentionally runs over a squirrel. It may be very disturbing for some viewers. It's only one episode and it's not the tone of the show.

In the Thorpe park episode, Simon is sexually harassed by his driving instructor. Not much is shown, apart from the instructor grabbing his thigh and moving her hand up slowly, making him visibly uncomfortable. It is implied, though never confirmed that the harassment got worse as Simon never talks about it afterwards.

Overall some scenes are sexually dark and have some dark comedy, however sometimes the jokes being made are graphic.

Neil is sexually harassed by the geography teacher Mr Kennedy throughout two episodes. In the field trip episode, he enters the boys dorm and inappropriately massages Neil's legs and in the fashion show episode, whilst drunk, he tries to undress Neil but is stopped by Mr Gilbert in both scenes.

The shows crudeness may be uncomfortable for some viewers.

The scene where Neil punches a fish to death isn't nice, but not disturbing or overly graphic. Played for laughs.