Final answer:
Religion has historically been the greatest influence on sexual behavior in most societies. Peers and the media have emerged as strong influences in recent years, especially among U.S. teens.
Step-by-step explanation:
Historically, religion has been the greatest influence on sexual behavior in most societies. What is considered "normal" in terms of sexual behavior is based on the mores and values of the society. Individuals are socialized to sexual attitudes by their family, education system, peers, media, and religion. In recent years, peers and the media have also emerged as strong influences on sexual behavior, particularly among U.S. teens (Potard, Courtois, and Rusch 2008).