Sex education is a contested site in the school curriculum as communities grapple with who should teach young people about sex and how it should be taught. In this paper we ask whether same-sex-attracted young people are being exposed to appropriate and relevant sex education at school, and if they are not whether it is necessary that sex education be inclusive of sexual difference. In the second Australian survey of 1749 same-sex-attracted youth of 14-21 years old, we ask young people about sex education classes at school, how useful they were for them, their sources of information regarding gay and lesbian relationships and safe sex, sexual behaviours and incidence of sexually transmissible infections and pregnancy. We find from the data that most of these young people found sex education to be useless because it was not inclusive. In comparison with normative studies, these young people were, on average, sexually active earlier, had higher rates of diagnosed sexually transmissible infections and at least as high an incidence of pregnancy. We conclude from the data that there is a need for sex education in schools to be inclusive of the sexuality of all students, not just those who are attracted to the opposite sex. (Contains 2 tables.)