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A longitudinal multi\u2010sample design was used. The first sample was recruited in a suburban context (<jats:italic>n<\/jats:italic>\u00a0=\u00a0265; 62% girls) and the second sample in an urban setting (<jats:italic>n<\/jats:italic>\u00a0=\u00a0136; 61% girls). All predictors were measured in Grade 8 and age at first intercourse was assessed yearly for three years. Being in a non\u2010intact family, low parental control, high antisocial behaviors, low self\u2010disclosure, high proportion of other\u2010sex friends and high substance use were associated with earlier sexual intercourse. When all predictors were considered simultaneously, more antisocial behaviors, high proportion of other\u2010sex friends and non\u2010intact family structure significantly discriminated youth reporting first intercourse at age 13 or less from those who reported first intercourse at age 14, at age 15, or were virgins at age 16 among both samples.<\/jats:p>","DOI":"10.1016\/j.adolescence.2010.05.002","type":"journal-article","created":{"date-parts":[[2010,7,14]],"date-time":"2010-07-14T08:43:15Z","timestamp":1279096995000},"page":"289-300","source":"Crossref","is-referenced-by-count":78,"title":["Individual, familial, friends\u2010related and contextual predictors of early sexual intercourse"],"prefix":"10.1002","volume":"34","author":[{"given":"Marie\u2010Aude","family":"Boislard P.","sequence":"first","affiliation":[{"name":"Universit\u00e9 du Qu\u00e9bec \u00e0 Montr\u00e9al Department of Psychology Montreal 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