1.   The questions about engagement in genital heterosexual activities were asked in a questionnaire that the teen-agers answered on a computer, at the end of the interview.

2.   Dr Low said women involved in heterosexual activity were vulnerable to the virus.

3.   Heterosexual activity has become the main mode of transmission as promiscuous men infect their wives and girlfriends, experts say.

4.   In Africa the disease is mostly spread through heterosexual activities.

5.   Gay defence force members had also complained that heterosexual activities were condoned and homosexual activities ostracized.