Adolescents are the target audience of the show.
Sex is the element used to attract the younger audience, assuming that sex is the primary concern of every teenager. Hardly a minute passes without some reference to explicit sex and body parts. References to size of genitalia, masturbation, breasts, and lude sex acts are made throughout the show, often mentioned in scenes in which such references don't apply. Sex is constantly on the forefront. Even more appalling is the development of a physical relationship between one of the students and his teacher.