Vulnerability for HIV and STI in PNG is slightly different in that the epidemic is concentrated in the usual populations of people exchanging sex and those engaging in anal sex, as well as those living in select geographic areas. Sexual literacy remains inadequate, and sexual violence is at epidemic proportions. Those vulnerable to victimisation include women, homosexual men, female to male transgender, and young men. The 3 epidemics are inextricably linked in terms of causation, an unsupportive legal environment and the populations subsequently vulnerable. Sexual health promotion, legal reform and quality sexual health services are required. Data will be presented from the recently completed Integrated Bio-Behavioural Surveillance Survey, as well as other published sources.