This study examined the effects of a sexual health curriculum developed for school psychological counsellors in Turkey on the sexual health knowledge of the participating candidates, their beliefs in sexual myths and their tendencies towards ambivalent sexism and sexism in romantic relationships. The study adopted a semi-experimental design. Study participants included an experimental group of 59 students from a programme of guidance and psychological counselling in Ege University's Faculty of Education and a comparison group of 33 students from the Department of Psychology in the Faculty of Letters. Findings suggested that the sexual health education curriculum increased knowledge of sexuality, decreased beliefs in sexual myths, and decreased ambivalent sexism and sexism in romantic relationships among the candidates.