The present study examines prevalence and correlates of exchanging sex for drugs, money, food shelter, or other favors (sex exchange) among a nationally representative sample of youth and young adults. Adolescents and young adults (n=11,620, 53% female, 47% male) from the National Longitudinal Study of Adolescent Health were used for the current sample. Participants completed in-home interviews at both waves. Results revealed that sex exchange was reported by 4.9% (n=569) of the population in wave 2 or wave 3, and 4.6% (n=26) of those who exchanged sex did so at both waves. More males reported exchanging sex than females (n=332 versus n=237). Respondents who reported child sexual abuse were more likely to exchange sex (95% CI 2.51-4.28, p<.05) than respondents who reported any other form of child abuse. Both males and females who engaged in sex exchange were at greater risk for sexually transmitted infections; however, the odds of ever exchanging sex were highest among males who ever had gonorrhea (OR=6.2; 95% CI 3.75-10.3). Although sex exchange has been studied extensively among homeless and runaway youth, the current study reveals sex exchange also occurs in the general population.