Commercial sexual exploitation of children (CSEC) is a commercial transaction that involves the sexual exploitation of a child, such as the prostitution of children and child pornography, or offering any sexual services of children for compensation, financial or otherwise.

CSEC is a form of contemporary slavery that often involves coercion and violence against children.

CSEC includes ‘child sex tourism’ and other forms of transactional sex where a child engages in sexual activities to have key needs fulfilled, such as food, shelter or access to education. It includes forms of transactional sex where the sexual abuse of children is not stopped or reported by household members, due to benefits derived by the household from the perpetrator.

It also potentially includes arranged marriages involving children under the age of consent, where the child has not freely consented to marriage and where the child is sexually abused.

CSEC is related to child trafficking.