Using the social survey technique, a random sample of 464 students from the Universidad Austral answered a structured questionnaire about behavior and attitudes towards sex. Results show that the majority of students have had sexual experiences. Men and women differ significantly in motivations and age at the start of their sexual activity, stability of their relationships, first sexual partner and emotional experiences. Sexual behavior is associated with age, years of university studies and geographical origin. On the contrary this behavior is weakly influenced by religion or family. Premarital sexual intercourse is accepted by the majority of students. Knowledge about sexual physiology and contraception is scarce in 30 to 80% of students. It is concluded that, since a great number of students have an active sexual life along with little knowledge in this topic, the University has to assume an active role in the sexual education of students.