Objective: To provide basic information on pre- and extramarital sex i
n the general population and other factors related to HIV transmission
. Design: Cross-sectional household survey in 18 countries of the deve
loping world, mainly in Africa and Asia. Respondents: Representative s
amples of 1300-6995 individuals aged 15-49 years, interviewed in 1989-
1993. Methods: Face-to-face interviewing. Results: We observed a huge
variability between study sites, with the proportion of men reporting
sexual contact outside regular partnerships in the last year ranging f
rom 4 to 47%. Contacts with sex workers range from 1 to 25%. Women wer
e much less likely to report non-marital sex than men. Conclusions: Th
is first cross-cultural attempt to examine aspects of sexual lifestyle
s suggests that broad generalizations about multiple-partner sexual ne
tworking in particular regions are misleading. Gender, marital status,
age and a few other demographic correlates were disclosed as powerful
determinants of sexual behaviour, although the strength of associatio
ns varied greatly between specific locations. Condom use was very low
in most study sites.