Sid The Sexist is very rude, perverted and usually talks about trying to get laid, most of the episode evolve around an adult theme of sex.
In the third episode, Sid has a very wet dream about him having sex with a hot blondie. He grows a boner and his flys are undone offscreen but the sex scene gradually increases in explicity until we see full nudity.
In the fifth and final episode, Sid masterbates over some porno magazines and is caught by his mates. The masterbation scene is on screen but at an angle where you cannot see his genitals.