title: Determinants of Heterosexual Adolescents Having Sex with Female Sex Workers in Singapore.
abstract: OBJECTIVE
  We assessed the proportion of and socio-ecological factors associated with ever having had sex with female sex workers (FSWs) among heterosexual adolescents. We also described the characteristics of the adolescents who reported inconsistent condom use with FSWs.
  
  
  METHODS
  This is a cross-sectional study (response rate: 73%) of 300 heterosexually active male adolescents of 16 to 19 years attending a national STI clinic in Singapore between 2009 and 2014. We assessed the ecological factors (individual, parental, peer, school and medial influences) and sexual risk behaviors using a self-reported questionnaire. Poisson regression was used to obtain the adjusted prevalence ratios (aPR) and confidence intervals (CI).
  
  
  RESULTS
  The proportion of heterosexual male adolescents who had ever had sex with FSWs was 39%. Multivariate analysis showed that significant factors associated with ever having had sex with FSWs were sex initiation before 16 years old (aPR 1.79 CI: 1.30-2.46), never had a sexually active girlfriend (aPR 1.75 CI 1.28-2.38), reported lower self-esteem score (aPR 0.96 CI: 0.93-0.98), higher rebelliousness score (aPR 1.03 CI: 1.00-1.07) and more frequent viewing of pornography (aPR 1.47 CI: 1.04-2.09). Lifetime inconsistent condom use with FSWs was 30%.
  
  
  CONCLUSIONS
  A significant proportion of heterosexual male adolescents attending the public STI clinic had ever had sex with FSWs. A targeted intervention that addresses different levels of influence to this behavior is needed. This is even more so because a considerable proportion of adolescents reported inconsistent condom use with FSWs, who may serve as a bridge of STI transmission to the community. National surveys on adolescent health should include the assessment of frequency of commercial sex visits and condom use with FSWs for long-term monitoring and surveillance.
authors.affiliation: Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
authors.forename: Junice Y S
authors.initials: JY
authors.lastname: Ng
authors.affiliation: Saw Swee Hock School of Public Health, National University of Singapore, Singapore, Singapore.
authors.forename: Mee-Lian
authors.initials: ML
authors.lastname: Wong
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D001290:Attitude; D017280:Condoms / Q000706:statistics & numerical data; D016001:Confidence Intervals; D003430:Cross-Sectional Studies; D004882:Erotica; D005260:Female; D020010:Heterosexuality; D006801:Humans; D008297:Male; D016487:Parenting; D010379:Peer Group; D015995:Prevalence; D012309:Risk-Taking; D012649:Self Concept; D057566:Self Report; D011477:Sex Work / Q000706:statistics & numerical data; D012725:Sexual Behavior / Q000706:statistics & numerical data; D012749:Sexually Transmitted Diseases / Q000453:epidemiology; D012846:Singapore / Q000453:epidemiology; D012959:Socioeconomic Factors; D011795:Surveys and Questionnaires; D055815:Young Adult