Like many other countries in southeast Asia, Cambodia is experiencing a rapidly growing AIDS epidemic. Particularly seriously affected are prostitutes and their clients. Young people may also be at increased risk, with some young men frequenting prostitutes either individually or in groups, and some young women lured into prostitution by the opportunity to earn relatively high wages. Men who have sex with prostitutes often have sex with other mainstream sex partners, thereby extending networks of HIV transmission. Findings are reported from an examination of dominant discourses about sex and sexuality in Cambodia, contemporary patterns of sexual behavior among young people, sexual meanings and practices, sexual relations among young people involving payment, and sexual relations not involving payment. Fieldwork for the study took place between February 1995 and April 1996, and included the collection of data through individual interviews, focus group interviews, and participant observation. 218 people aged 13-26 years participated in individual interviews. Of those, 71 men and 52 women were interviewed in Phnom Penh, and 75 men and 83 women were interviewed in selected villages.