title: Condom use motivations and selected behaviours with new versus established sex partners.
abstract: Objective To compare condom use motives and behaviours in the context of penile-vaginal intercourse (PVI) with new versus established sexual partners, using daily event-level data among a clinic-recruited sample.
  
  
  METHODS
  Participants (ages 15-65 years old) were recruited from five sexually transmissible infection (STI) clinics in three United States cities. They were provided with personal digital assistants and instructed to respond to daily questionnaire items regarding PVI events from the past 24h. Generalised estimations equations were used to make inferences on age-adjusted estimated odds ratios, comparing events occurring with established versus new partners.
  
  
  RESULTS
  For males, pregnancy prevention was a more common motivation for condom use in new relationships (P<0.001). Males with new sex partners were more likely to report condom use (P<0.005) and also reported fewer errors or problems in condom use with new sex partners (P<0.001). For females, pregnancy prevention (P=0.03), STI acquisition (P<0.001) and STI transmission (P=0.005) were more likely to be motives for condom use with new versus established partners. Also, females with new sex partners were more likely to report condom use (P<0.001) as well as using multiple condoms during a single event (P=0.03).
  
  
  CONCLUSIONS
  Event-level findings suggest that condom use motivations and behaviours vary depending on whether PVI occurs between established versus new sex partners. Condom use is more likely for PVI with new partners, but other condom-associated behaviours and motivations differ between females and males.
authors.affiliation: College of Public Health at the University of Kentucky, Lexington, KY 40506, USA.
authors.forename: Richard A
authors.initials: RA
authors.lastname: Crosby
authors.affiliation: Rural Center for AIDS/STD Prevention at Indiana University, Bloomington, IN 47405, USA.
authors.forename: Robin R
authors.initials: RR
authors.lastname: Milhausen
authors.affiliation: Rural Center for AIDS/STD Prevention at Indiana University, Bloomington, IN 47405, USA.
authors.forename: Cynthia A
authors.initials: CA
authors.lastname: Graham
authors.affiliation: Rural Center for AIDS/STD Prevention at Indiana University, Bloomington, IN 47405, USA.
authors.forename: William L
authors.initials: WL
authors.lastname: Yarber
authors.affiliation: Rural Center for AIDS/STD Prevention at Indiana University, Bloomington, IN 47405, USA.
authors.forename: Stephanie A
authors.initials: SA
authors.lastname: Sanders
authors.affiliation: College of Public Health at the University of Kentucky, Lexington, KY 40506, USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Charnigo
authors.affiliation: Division of Adolescent/Young Adult Medicine, Boston Children's Hospital, Boston, MA 02115, USA.
authors.forename: Lydia A
authors.initials: LA
authors.lastname: Shrier