Occasional nudity - Jack Whitehall loses his clothes. His butt is shown and he covers his crotch with his hands. It is quite a lengthy scene.
It is a running joke that two people are having sex. We hear it and (one time) see it.
There is a one second shot of a vagina with pubic hair but unless you pause the screen you will miss it.
The headmaster interviews a man dressed in medieval dress who sells medieval themed pornography. The front cover of the magazine details a knight with a giant detailed penis used as a sword (very graphic).
One episode we see cars in a field with misted windows and hear moaning. It is implied couples are having sex in them.
There are many innuendo's and sexual remarks made throughout the series
One particualar student (cough cough Chantelle) flirts with the teacher but in a comedic style.
In one episode we hear loud sexual noises coming from a room while two other people sit in another room. comedic style.
In another episode it is implied that two people are engaging in fellatio with someone underneath a desk with a man sitting in a chair.