Abstract This article investigates whether a market for unsafe sexual activity exists among nonmarital, noncommercial sexual relationships in a high HIV/AIDS environment. The exchange of money for sex without a condom is well known within commercial sexual partnerships, but it is unclear from the previous evidence whether markets can emerge among noncommercial relationships as well. I use data on nonmarital sexual partnerships and transfers from Kisumu, Kenya, to investigate this question. I define and measure transfers as material items given by a male to his female sexual partner, including money and nonmonetary items, such as gifts, meals, and rent. I find a strong negative relationship between the level of transfers and condom use after controlling for male fixed effects and other important female and partnership characteristics. I also find that nonmonetary transfers have the same relationship with condom use as monetary transfers. Furthermore, I test the assumption that adolescent girls are particul...