A survey conducted among the lower-class urban population of Delhi, In
dia to describe the heterosexual behaviour, condom usage and awareness
about STDs/AIDS revealed that 4.4% respondents had sex outside/before
marriage. Female commercial sex workers, friends and neighbours were
the important sexual partners. Heterosexual activity was significantly
higher among males, unmarried, literates and middle/higher income gro
ups. Almost half of those who had sex before/outside marriage never us
ed a condom during the sexual encounter. Though only a small fraction
of the population was found to be engaged in extra-/pre-marital sex, t
he overall impact of this may be multifold, given the nature and modes
of HIV transmission. The superficial and inadequate Knowledge regardi
ng STDs/AIDS among this population, especially among those having extr
a-/pre-marital sex, indicates an urgent need for appropriately targete
d health education and condom promotion activities in the community wi
th an endeavour to increase awareness about STDs and HIV/AIDS and moti
vate people towards healthy sexual lifestyles.