Changes in male sexual behaviour in response to the AIDS epidemic: evidence from a cohort study in urban Tanzania.

Objective: To examine changes in sexual behaviour among men in urban Tanzania.

Design: An observational cohort study among factory workers during 1991-1994.

Methods: Data from five follow-up visits with structured questionnaire-guided interviews and biomedical data were analysed to examine trends in sexual behaviour and sexually transmitted disease/HIV among 752 men.