Young people are a key group for HIV prevention in the Pacific region where levels of STIs are high and condom use is low. During 2008, 62 in-depth interviews were conducted with people aged between 18 and 25 years in Tonga and Vanuatu. The research was aimed at understanding factors impacting on young peoples' condom use in two Pacific Island nations. The data show a marked disjuncture between attitudes and practice with regard to condoms. This paper discusses factors underpinning that inconsistency and directs attention to the effect of social and cultural influences on young people's condom use. The authors conclude that individual-level approaches to improving rates of condom use will be inadequate unless they are informed by an understanding of the role of identity, culture and tradition in young peoples' decisions around condom use. The findings also underline the need for country-specific approaches to condom promotion efforts in the Pacific.