This paper pays attention to the availability, generation, and accessibility of sex-disaggregated data. It argues that the collection of sex-disaggregated data is an essential tool for effective and equitable humanitarian responses, as it allows a deeper and richer analysis on the gendered impacts of a disaster. Through an extensive literature research, the author demonstrates a lack of sex-disaggregated data collection, and attributes this to the lack of proper training for actors responding to situations of emergency. ‘Saving lives’ is somewhat opposed to, and prioritised, over sex-disaggregated data collection, whereas this could precisely be used to design better prevention and response strategies on the ground.