Song Anna V, Halpern-Felsher Bonnie L
Division of Adolescent Medicine, Department of Pediatrics, University of California-San Francisco, 3333 California Street 245, San Francisco, CA 94118, USA.
Arch Pediatr Adolesc Med. 2011 Mar;165(3):243-9. doi: 10.1001/archpediatrics.2010.214. Epub 2010 Nov 1.
To (1) identify the temporal order between oral and vaginal sex onset; (2) test whether oral sex or vaginal sex is a risk or protective factor for the other; and (3) determine whether the relationship between oral and vaginal sex varies across time.
Prospective, longitudinal study with 6-month assessments conducted between 2002 and 2005.
Self-administered surveys completed during class time.
At baseline, 627 ninth grade high school students from 2 northern California schools were included in the study.
Oral and vaginal sex onset.
Among sexually active adolescents, most initiated vaginal sex after or within the same 6-month period of oral sex initiation. Adolescents who initiated oral sex at the end of ninth grade had a 50% chance of initiating vaginal sex by the end of 11th grade. In comparison, adolescents who delayed until the end of 11th grade had a 16% chance of initiating vaginal sex by the end of 11th grade.
The first 2 years of high school may be a critical age period for adolescents' vulnerability to vaginal sex initiation via oral sex behaviors. Comprehensive evidenced-based interventions and provision of preventive services aimed toward reducing sexual risk should be expanded to include the role oral sex plays in adolescent sex behavior.
（1）确定口交和阴道性交开始的时间顺序；（2）测试口交或阴道性交是否是另一方的风险因素或保护因素；（3）确定口交和阴道性交之间的关系是否随时间变化。
2002年至2005年期间进行的前瞻性纵向研究，每6个月评估一次。
在课堂时间内完成的自我管理调查。
基线时，来自北加利福尼亚州2所学校的627名九年级高中生被纳入研究。
口交和阴道性交开始情况。
在有性行为的青少年中，大多数人在开始口交后的6个月内或同一时期开始阴道性交。在九年级末开始口交的青少年到十一年级末有50%的可能性开始阴道性交。相比之下，推迟到十一年级末才开始口交的青少年到十一年级末有16%的可能性开始阴道性交。
高中的头两年可能是青少年因口交行为而容易开始阴道性交的关键年龄段。应扩大基于证据的综合干预措施和提供预防性服务，以减少性风险，将口交在青少年性行为中所起的作用包括在内。
