@article{ref1,
title="Substance Use and Sexual Intercourse Onsets in Adolescence: A Genetically Informative Discordant Twin Design",
journal="Journal of Adolescent Health",
year="2014",
author="Deutsch, Arielle R. and Slutske, Wendy S. and Heath, Andrew C. and Madden, Pamela A. F. and Martin, Nicholas G.",
volume="54",
number="1",
pages="114-116",
abstract="PURPOSE: Using a genetically informed, discordant twin analysis, the objective of this study was to examine whether earlier onset of drinking and smoking behaviors predicted early sexual intercourse onset. METHODS: Over 3,400 adult same-sex twins from the Australian Twin Registry completed a structured interview that included retrospective reports on onsets of smoking, drinking, intoxication, and sexual intercourse and conduct disorder symptoms. A two-level frailty model estimated within-twin-pair and between-twin-pair comparisons. Onsets of smoking, drinking, drunkenness, and conduct disorder symptoms were estimated as sexual intercourse onset predictors. RESULTS: After controlling for conduct disorder, smoking and drinking onset did not predict sexual intercourse onset for either within-twin-pair or between-twin-pair comparisons. Drunkenness onset had a significant effect on sexual intercourse onset, such that twins who first experienced alcohol intoxication at a younger age than their co-twins were also more likely to have sex earlier than their co-twins. CONCLUSIONS: Relationships between substance use and sexual intercourse onsets may be due mostly to shared underlying factors; there was only a small relation between intoxication onset and sexual intercourse onset, and no direct relation between smoking and drinking onset and sexual intercourse onset.<p /><p>Language: en</p>",
language="en",
issn="1054-139X",
doi="10.1016/j.jadohealth.2013.07.013",
url="http://dx.doi.org/10.1016/j.jadohealth.2013.07.013"
}