In line with this approach it is the sexual exploitation that is central for the violation in sex trafficking, not the actual movement of crossing borders. The exploitation of women in prostitution is considered as the most severe form of male domination, and can according to the approach in this study, not be separated from sex trafficking. A methodological consequence of this is that both sex trafficked women and what others perhaps would define as migrants for sex work and sex workers are categorized together in the study. The thematic fields and the questionnaires that were formulated in the study reflect this approach.