Words matter because they affect how we conceptualise problems, prioritise issues, and forge responses. Inconsistent use of language and terms can lead to inconsistent laws and policy responses on the same issue. Despite the existence of legal definitions for a number of sexual crimes against children, there is still considerable confusion surrounding the use of different terminology related to the sexual exploitation and sexual abuse of children. Even where the same terms are used, there is quite often disagreement concerning their actual meaning, leading to use of the same words to refer to different actions or situations. This has created significant challenges for policy development and programming, development of legislation, and data collection, leading to flawed responses and limited and ineffective methods of measuring impact or setting targets.