This paper attempts to identify some factors associated with extramarital sex by men in the Mbeya region of Tanzania using data
from a survey conducted in 2003/2004. The choice of Mbeya region was prompted by the fact that it has been found by previous
studies to be one of the regions with the highest HIV prevalence rate in Tanzania. Correlates of extramarital sex that were considered
include current age, education, residence, age at first sexual intercourse, age at first marriage and sex before marriage. A bivariate
analysis of the survey data, which comprised a sample size of 568 married men aged between 15 and 62 years revealed statistically
significant association between extramarital sex with current age, education, age at first intercourse and sex before marriage. The
effect of these variables was tested through a multivariate logistic regression analysis and all the four independent variables were
found to be statistically significant predictors of extramarital sex in Mbeya region.