Declines in casual sex in Lusaka, Zambia: 1996-1999.

This study examines whether changes in reported sexual behavior in Lusaka, Zambia, are consistent with the evidence of declining HIV prevalence levels reported elsewhere. A comparison of findings from two cross-sectional surveys implemented in Lusaka between 1996 and 1999 shows statistically significant reductions in casual partnerships among men and women. Respondents with higher socioeconomic status were more likely to reduce casual sex. Condom use increased but the change was not statistically significant.