目的：了解15～24岁校外未婚青年与异性/同性发生性行为的状况及其影响因素，为向该人群提供性与生殖健康教育和服务提供依据。方法：在中国6个省的城市和农村地区，对1113人校外未婚青年进行计算机辅助的自填匿名问卷调查。结果：15～18岁组和19～24岁组男性异/同性间性行为发生率均高于女性（P＜0.05）。异性间性行为时，15～18岁组7.14%的女性报告首次性行为属被迫发生；15～18岁组和19～24岁组男、女性首次性行为安全措施的使用率为66.67%和40.00%及58.82%和49.11%，男性报告使性伴怀孕和女性报告怀孕的比例接近（30.00%）；19～24岁组性伴个数2名及以上男性报告率高于女性（P＜0.01）。同性间性行为时，15～18岁组男、女性报告平均年龄仅14岁；19～24岁组15.79%的男性报告首次性行为属被迫发生，46.15%的男性和33.33%的女性报告有2名以上性伴。多因素分析显示，男、女性与异性发生性行为共同的危险因素为看黄色制品和年龄较大（OR男分别为3.51和3.81，OR女分别为6.41和3.58）；与赞成婚前性行为相比，本人不能接受婚前性行为（OR=0.18）、父母不能接受婚前性行为（OR=0.37）和朋友持无所谓态度（OR=0.47）是男性的保护因素；与赞成婚前性行为相比，自己认为婚前性行为不好（OR=0.14）和不能接受（OR=0.06）、朋友不能接受婚前性行为（OR=0.16）和不清楚朋友态度（OR=0.21）是女性的保护因素，父母持无所谓态度是女性的危险因素（OR=12.56）。结论：校外未婚青年与异性/同性的性行为及危险性行为发生率较高，并与接触过黄色制品、个人及父母/同伴的开放态度呈正相关。%Objective:To explore heterosexual and homosexual behaviors, and influencing factors, in those unmarried out-of-school young people aged 15 to 24 years, so as to provide the basis on the education and service of sexual and reproductive health for those young people. Methods:The questionnaire survey form was anonymously filled out by 1 113 unmarried out-of-school young people on six target spots in urban and rural areas of six provinces by the computer assisted self-interview(CASI) system. Results:The incidences of hetero-or homo-sexual behaviors in the 15 to 18 years male group and the 19 to 24 years male group were significantly higher than those in female groups (P<0.05). 7.14% of the first heterosexual behaviors in the 15 to 18 years female group were forced. Sexual safety precautions were used in 66.67%of males and 40.00%of females in the 15 to 18 years group, and in 58.82% of males and 49.11% of females in the 19 to 24 years group. About 30.00% of males reported that they had partners′ pregnancies, and 30% of females reported that they had pregnancies. The incidence of multiple sexual partners in the 19 to 24 years male group was significantly higher than that in the age-matched female group (P<0.01). On homosexual behaviors, the average age of the first homosexual behaviors in the 15 to 18 years group was about 14 years, 15.79% of males in the 19 to 24 years group were forced to have, and 46.15% of males and 33.33% females reported that they had more than two sexual partners. Multivariate analyses showed that watching pornographic materials and being older were common risk factors of heterosexual behaviors for males (OR,3.51 and 3.81 respectively) and females(OR,6.41 and 3.85 respectively). Compared with those factors approving premarital sexual behaviors, the attitudes rejecting premarital sexual behaviors from respondents themselves (OR=0.18) and their parents (OR=0.37), and the neutral attitude from friends (OR=0.47), were protective factors in males, while the options that the female respondents thought it being not good but acceptable(OR=0.14) or opposed(OR=0.06), and that friends thought it being unacceptable (OR=0.16) or unknown (OR=0.21), were protective factors and the neutral attitude from parents was risk factor (OR=12.56) in females. Conclusions:The incidences of heterosexual and homosexual behaviors, and unsafe sexual behaviors, in those unmarried out-of-school young people were high, which were positively related to the pornographic material and the open attitudes from respondents themselves, parents and friends.
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