A recent study presented at the 8th International Conference on AIDS in Asia and the Pacific last week shows that the HIV/AIDS epidemic in Asia is largely being driven by wealthy men, disputing the idea that it is fueled by impoverished members of society.

The study, commissioned by UNAIDS and the Asian Development Bank, highlighted the fact that men who have unprotected sex with many partners, often sex workers, are a major cause for the spread of HIV—and it’s often wealthier men who can afford to pay for sex partners.