This study employed Interpretative Phenomenological Analysis to explore eight fathers’ perceptions and practices in talking to their ten year old children about puberty, relationships and reproduction. The fathers participated in face to face interviews which were analysed idiographically initially, followed by analysis at the group level. Interpretations were then developed through critical application of a Foucauldian lens of governmentality and biopower. The results revealed a tension between the fathers’ cognitions, accounts and behaviours. Their practices were largely characterised by silence yet they reported positive attitudes towards children's sexuality education and perceived themselves as equipped and willing to take on the role of sexuality educator. They also reported enjoying open relationships with their children. Interpretations centred on contradictions and conflict between the majority of the fathers’ aspirations and the compelling nature of the childhood innocence discourse as a technology of governmentality. Whilst all of the fathers felt that it was in their children's interests to learn about sexuality, all but one adhered to hegemonic protective discourses and unquestioningly integrated their normalising effects into their fathering practices which, it is argued, may paradoxically render their children more vulnerable both now and in the future.