The term Travelling Child Sex Offender (TCSO) has become a widely used alternative to the inadequate concept of the ‘sex tourist’ and describes individuals who travel across jurisdictions to facilitate the sexual abuse or sexual exploitation of children. Since 2002, Mentor Forensics has been conducting qualitative research with this group by listening to their accounts and broadening our understanding of the nature and extent of sexual exploitation perpetrated by TCSOS shedding light on their motivations, planning and tactics. This paper summarises the findings of this research to date.