This study explores the phenomena of commercial sexual exploitation of children and the background of those young prostitutes in Taichoung County in Taiwan during 1995-2001. Based on large amount of various case reports and juridical documents, the researcher uses content analysis and framework analysis to analyze the data and describe the characteristics of those girls (N=221) . This paper argues, young girls working in commercial sexual industry remains a fact of sexual exploitation, although the problem of forced prostitution (population trafficking) seems less serious now. The current phenomena of voluntary prostitution that young girls involved, mainly called ‘compensated dating (enjokosai)’, has changed the traditional public images and attitudes toward this social problem, and makes it less legitimate to intervene and to provide support and resources for those girls. While the boundaries between child/adult, forced/voluntary prostitution, sexual exploitation/commercial trafficking are getting ambiguous, the changing sexual industry has indeed brought dilemmas to the social protection system and social work practice. Therefore, looking into the loopholes in the law and policies related to youth prostitution, this paper calls for more attention to comprehend the nature of youth prostitution and changing juvenile culture.