Improving understanding of risk factors for risky sexual behaviour is fundamental to achieve better population sexual health. This study explored associations between ACEs and poor sexual health outcomes in the UK. Findings highlight the need for effective interventions to prevent and ameliorate the lifelong effects of ACEs. Trauma-informed relationships and sex education, sexual health services, and antenatal/postnatal services, particularly for teenagers and young parents, could provide opportunities to prevent ACEs and support those affected.