The Learning Initiative on Norms, Exploitation and Abuse (LINEA) is a cluster randomised controlled trial (CRCT) of an intervention (radio drama and curricula) which aims to prevent age-disparate transactional sex in Tanzania. There is a quasi-experimental, non-randomised, component which aims to estimate impact of the intervention on community-wide social norms. This dataset contains the responses to a structured survey conducted at baseline before randomisation to and implementation of the LINEA intervention, among general populations of girls/women and boys/men aged 13 years and over. The surveys covered topics including socio-demographics, schooling, sexual behaviour, receipt and giving of gifts in the context of sex, attitudes to violence, and attitudes to age-disparate transactional sex.