title: Determinants and Correlates of Preventive Behaviors at First Sex With a First Partner and Second Partner: Analysis of the FECOND Study.
abstract: This study explores transitions in contraceptive use in early sexual life in France and has three objectives: describe predictors of contraceptive use at first sex with first and second partners, describe contraceptive trajectories in these partnerships, and test associations between use at first sex and switching in first partnership on use with second partner.
  
  
  
  Our analyses include 1,823 participants, aged 15-29 years, of the 2010 French national sexual health survey who reported at least two lifetime sexual partners and a subset of 1,593 people who report contraceptive use throughout their first partnership. We use logistic regression and generalized estimating equation models to investigate the three objectives.
  
  
  
  Our results reveal a decline in contraceptive use between first and second partner, driven primarily by decreases in condom use, from 87.9% to 79.5% between first and second partner. This is partially offset by an increase in use of effective methods (from 7.8% to 38.1%), particularly by women. Any method use and discontinuation with first partner were predictors of patterns with second partner.
  
  
  
  Analysis of early transitions in contraceptive use of adolescents in early sexual life reveals shifts from sexually transmitted infection to pregnancy prevention and an increase in unprotected sex.
authors.affiliation: Child Trends, Bethesda, Maryland; Department of Population, Family, and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland. Electronic address: hannah.lantos@gmail.com.
authors.forename: Hannah
authors.initials: H
authors.lastname: Lantos
authors.affiliation: INSERM U1018.
authors.forename: Nathalie
authors.initials: N
authors.lastname: Bajos
authors.affiliation: Department of Population, Family, and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland; INSERM U1018.
authors.forename: Caroline
authors.initials: C
authors.lastname: Moreau
mesh_terms: D000293:Adolescent; D000328:Adult; D003075:Coitus; D003267:Contraception / Q000379:methods / Q000523:psychology / Q000706:statistics & numerical data*; D003430:Cross-Sectional Studies; D005260:Female; D005602:France; D006306:Health Surveys; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D011247:Pregnancy; D011253:Pregnancy in Adolescence / Q000517:prevention & control*; D012725:Sexual Behavior / Q000706:statistics & numerical data*; D012747:Sexual Partners / Q000523:psychology*; D055815:Young Adult
keywords: Adolescents; Contraceptive use; Dual method use; First partner; France; Hormonal methods; Pregnancy prevention; STIs