This paper illuminates how teachers are influenced by age, gender and sexuality in teaching about sex and relationships. In this analysis grounded in feminist theory, age, gender and sexuality are considered to be enacted as doings. Six interviews with teachers working with sexuality education in K-12 schools in Sweden were chosen from of a larger body of material consisting of 21 interviews with professionals engaged in school-based sexuality education. The six interviewees were selected because they explicitly addressed how teachers' age, gender and/or sexuality come to matter in the classroom. Findings show how male and female teachers organise their teaching in relation to normative expectations of age, gender and sexuality. In sexuality education, the diverse life-courses of (hetero)sexual women offer a wide range of pedagogic possibilities for female teachers to address issues of sexuality, consent and relationships whereas male teachers are constrained to doing safe(r) forms of masculinity by directing attention away from their bodies and experiences. In understanding these results, I argue that the figure of the "tant" has been key in forming the pedagogic backdrop to Swedish sexuality education, hence embedding a normative 'who' in the 'how' to teach sexuality education.