1. Prior sexual behaviour of teenagers attending rap sessions for the first time;Akpom;Family Planning Perspectives,1976
2. Education in Sex and Personal Relationships;Allen,1987
3. Does sex education lead to earlier or increased sexual activity in youth?;Baldo,1993
4. Human Sexuality and its Problems;Bancroft,1989
5. Surveys of American adolescents have found that the average age of first intercourse ranges from 16–16.9 years;Bigler;Siecus,1989